检索结果-内蒙古大学图书馆

arXiv 2021年

作者： Liu, Peixi Jiang, Jiamo Zhu, Guangxu Cheng, Lei Jiang, Wei Luo, Wu Du, Ying Wang, Zhiqin State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing China Shenzhen Research Institute of Big Data Shenzhen China China Academy of Information and Communications Technology China College of Information Science and Electronic Engineering Zhejiang University Hangzhou China

Training a machine learning model with federated edge learning (FEEL) is typically time-consuming due to the constrained computation power of edge devices and limited wireless resources in edge networks. In this paper, the training time minimization problem is investigated in a quantized FEEL system, where the heterogeneous edge devices send quantized gradients to the edge server via orthogonal channels. In particular, a stochastic quantization scheme is adopted for compression of uploaded gradients, which can reduce the burden of per-round communication but may come at the cost of increasing number of communication rounds. The training time is modeled by taking into account the communication time, computation time and the number of communication rounds. Based on the proposed training time model, the intrinsic trade-off between the number of communication rounds and per-round latency is characterized. Specifically, we analyze the convergence behavior of the quantized FEEL in terms of the optimality gap. Further, a joint data- and-model-driven fitting method is proposed to obtain the exact optimality gap, based on which the closed-form expressions for the number of communication rounds and the total training time are obtained. Constrained by total bandwidth, the training time minimization problem is formulated as a joint quantization level and bandwidth allocation optimization problem. To this end, an algorithm based on alternating optimization is proposed, which alternatively solves the subproblem of quantization optimization via successive convex approximation and the subproblem of bandwidth allocation via bisection search. With different learning tasks and models, the validation of our analysis and the near-optimal performance of the proposed optimization algorithm are demonstrated by the experimental results. © 2021, CC BY-NC-SA.

关键词： Economic and social effects

来源：评论

学校读者我要写书评

暂无评论

Diversified rotation systems improve grain yield and water use efficiency of winter wheat under limited irrigation in the North China Plain

引用

The Crop Journal 2025年

作者： Lei Yang Lang Cheng Pin Wang Huiling Zhao Jie Zhao Huadong Zang Yadong Yang Zhaohai Zeng State Key Laboratory of Maize Bio-breeding College of Agronomy and Biotechnology China Agricultural University Beijing 100193 China Crop Research Institute Anhui Academy of Agricultural Sciences Hefei 230031 Anhui China College of Plant Science and Technology Huazhong Agricultural University Wuhan 430070 Hubei China

Diversifying crop rotation aims to balance production and ecological concerns. However, yield and water use efficiency (WUE) of crop in diversified rotation systems have not been well documented, especially under limited irrigation. Here, we conducted a 6-year experiment with five treatments: 1) wheat-maize cropping system (WM), as control; 2) WMME, spring maize → WM rotation; 3) WMML, spring millet → WM rotation; 4) WMMP, spring peanut → WM rotation; and 5) WMMS, spring soybean → WM rotation, to explore how diversified rotations affected yield and WUE of wheat. Results showed that approximately 60 % higher precipitation during wheat growing season in Cycle 1 (2015–2017) resulted in yield increases by 33.8 %–55.7 % compared to those in Cycle 2 (2017–2019) and Cycle 3 (2019–2021). Grain yield and WUE of wheat were 16.7 % and 9.6 % higher in Cycle 1, 81.5 % and 86.8 % higher in Cycle 2, and 56.1 % and 78.7 % higher in Cycle 3 on average in diversified rotations compared to those in WM, respectively. Further analysis revealed that spike number and aboveground biomass were the main contributors to the increments, which can be explained by the increased evapotranspiration during the middle-late wheat growth stages (e.g., regreening, jointing, and anthesis) in diversified rotations. In general, diversified rotations enhanced synchronization of soil water supply with crop water demand by affecting the spatiotemporal dynamics of soil moisture under varied precipitation conditions, thereby increasing yield and WUE of wheat. Hence, diversified spring crops → WM rotations offer a sustainable and efficient strategy for enhancing wheat production and water conservation in dry areas.

关键词： Rotation system Yield component Soil water storage Evapotranspiration

来源：评论

学校读者我要写书评

暂无评论

MeerKAT discovery of GHz radio emission extending from Abell 3017 toward Abell 3016

arXiv

引用

arXiv 2024年

作者： Hu, Dan Werner, Norbert Xu, Haiguang Zheng, Qian Breuer, Jean-Paul Wu, Linhui Duchesne, Stefan W. van Weeren, Reinout J. Sun, Ming Zhang, Congyao Johnston-Hollitt, Melanie Shan, Huanyuan Guo, Quan Zhu, Zhenghao Wang, Jingying Gu, Junhua Zhao, Yuanyuan Siew, Hoongwah Mao, Junjie Zhang, Zhongli Plšek, Tomáš Department of Theoretical Physics and Astrophysics Faculty of Science Masaryk University Kotlářská 2 Brno611 37 Czech Republic School of Physics and Astronomy Shanghai Jiao Tong University Dongchuan Road 800 Shanghai200240 China Shanghai Astronomical Observatory Chinese Academy of Sciences Nandan Road 80 Shanghai China Department of Physics Graduate School of Advanced Science and Engineering Hiroshima University Kagamiyama 1-3-1 Higashi-Hiroshima739-8526 Japan CSIRO Space & Astronomy PO Box 1130 BentleyWA6102 Australia Leiden Observatory Leiden University PO Box 9513 Leiden2300 RA Netherlands Department of Physics and Astronomy University of Alabama in Huntsville HuntsvilleAL35899 United States Curtin Institute for Computation Curtin University GPO Box U1987 PerthWA6845 Australia National Astronomical Observatories Chinese Academy of Sciences 20A Datun Road Beijing100101 China Department of Astronomy Tsinghua University Beijing100084 China Key Laboratory of Radio Astronomy and Technology Chinese Academy of Sciences A20 Datun Road Chaoyang District Beijing100101 China

Context. Cosmic filaments are vast, faint structures that connect galaxy clusters, often challenging to detect directly. However, filaments between pre-merger cluster pairs become more visible due to gas heating and compression while the clusters are approaching, enabling detection in X-ray and radio wavelengths. The clusters Abell 3017 and Abell 3016 are located within such a large-scale filament. A prominent X-ray bridge has been detected connecting the two clusters and a potential galaxy group between them. Aims. The aim of this work is to investigate the existence of a radio bridge in the filament between Abell 3017 and Abell 3016, to explore other diffuse radio structures within this system, and to investigate the origins of these diffuse radio emission. Methods. We analyzed MeerKAT L-band data to study the morphology and spectra of the diffuse radio structures in Abell 3016-Abell 3017. X-ray imaging and spectral analysis were carried out with archival Chandra and XMM-Newton data. Additionally, correlations between radio (IR) and X-ray surface brightness (IX) were generated to explore the connections between thermal and non-thermal components in the diffuse radio emission. Results. We detected a faint radio bridge with an average surface brightness of ∼ 0.1 µJy arcsec−2 at 1280 MHz using MeerKAT. It connects Abell 3017 with a potential galaxy group and extends towards Abell 3016, aligning with the X-ray bridge. A high X-ray temperature of 7.09±0.54 keV detected in the bridge region suggests an interaction between Abell 3017 and the group. In Abell 3017, we identified two distinct components of diffuse radio emission: a radio mini-halo and an outer radio halo with a northern extension (N-extension hereafter). The radio surface brightness profile of Abell 3017 shows a steep inner component consistent with other mini-halos, and a faint outer component likely linked to an infalling subcluster. The IR − IX diagram indicates superlinear and sublinear correlations for

关键词： Cosmology

来源：评论

学校读者我要写书评

暂无评论

An ionic covalent organic framework showing super-performance for recovery of gold from e-waste

引用

Separation and Purification technology 2025年 375卷

作者： Xing Liu Yuxuan Liu Liecheng Guo Lele Gong Xianqing Xie Zhiwu Yu Feng Luo School of Chemistry and Materials Science East China University of Technology Nanchang 330013 China State Key Laboratory of NBC Protection for Civilian Beijing 100191 China National Engineering Research Center for Carbonhydrate Synthesis Jiangxi Normal University Nanchang 330027 China High Magnetic Field Laboratory Chinese Academy of Sciences Hefei 230031 Anhui China

Recovery of gold from e-waste is now highly desirable from the viewpoint of both environmental protection and sustainable development. Herein, we report a novel ionic COF (covalent organic framework, ECUT-COF-26) for such use. Through both electrostatic interaction and photocatalytic reduction, ECUT-COF-26 enables an ultrafast gold extraction efficiency with a removal efficiency of >99 % within 1 min and a super-high extraction capacity of 5.3 g/g. Such value far exceeds most of the established materials for such use. ECUT-COF-26 is also found to give an impressively ultrastrong concentrating ability with a reduction of gold concentration down to 1.2 ug/L within 60 min, a super-high selectivity (S Au/M = ∼10 6) and a good recycling ability. Its practical application is confirmed by a gold recovery from e-waste with a 100 % gold recovery and a gold production in a 23.8 Karat purity (99.3 %).

关键词： Recycling

来源：评论

学校读者我要写书评

暂无评论

Can we understand the decay width of the Tcc+ state?

arXiv

引用

arXiv 2021年

作者： Ling, Xi-Zhe Liu, Ming-Zhu Geng, Li-Sheng Wang, En Xie, Ju-Jun School of Physics Beihang University Beijing102206 China School of Space and Environment Beihang University Beijing102206 China Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang University Beijing102206 China School of Physics and Microelectronics Zhengzhou University Henan Zhengzhou450001 China Institute of Modern Physics Chinese Academy of Sciences Lanzhou730000 China School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing101408 China Lanzhou Center for Theoretical Physics Key Laboratory of Theoretical Physics of Gansu Province Lanzhou University Gansu Lanzhou730000 China

Inspired by the recent discovery of a doubly charmed tetraquark state Tcc+ by the LHCb Collaboration, we employ the effective Lagrangian approach to investigate the decay width of Tcc+ → D+D0π0/D0D0π+ and Tcc+ → D0D+γ with the assumption that Tcc+ is an isoscalar DD∗ molecule. We show that both the Tcc → DDπ and Tcc → DDγ modes contribute to the decay width of Tcc, with the former being dominant. The resulting total decay width of about Γ = 63 keV is smaller than the experimental decay width obtained from the Breit-Wigner fit of the LHCb data, Γ = 410±165±43+18−38 keV, while close to the number obtained from the alternative unitary analysis, Γ = 48 ± 2+0−14 keV, which supports the molecular nature of Tcc © 2021, CC BY.

关键词： Lagrange multipliers

来源：评论

学校读者我要写书评

暂无评论

Characteristic time of stellar flares on Sun-like stars

arXiv

引用

arXiv 2021年

作者： Yan, Yan He, H. Li, C. Esamdin, A. Tan, B.L. Zhang, L.Y. Wang, H. National Astronomical Observatories Chinese Academy of Sciences Beijing100101 China CAS Key Laboratory of Solar Activity Chinese Academy of Sciences Beijing100101 China School of Astronomy and Space Science Nanjing University Nanjing210023 China Xinjiang Astronomical Observatory Chinese Academy of Sciences Urumqi830011 China College of Physics Guizhou University Guiyang550025 China Center for Solar-Terrestrial Research New Jersey Institute of Technology University Heights NewarkNJ07102-1982 United States Key Laboratory for Modern Astronomy and Astrophysics Ministry of Education Nanjing210023 China University of Chinese Academy of Sciences Beijing100049 China

Using the short-cadence data (1-min interval) of the Kepler space telescope, we conducted a statistical analysis for the characteristic time of stellar flares on Sun-like stars (SLS). Akin to solar flares, stellar flares show rise and decay light-curve profiles, which reflect the two distinct phases (rise phase and decay phase) of the flare process. We derived characteristic times of the two phases for the stellar flares of SLS, resulting in a median rise time of about 5.9 min and a median decay time of 22.6 min. It is found that both the rise time and the decay time of the stellar flares follow a lognormal distribution. The peak positions of the lognormal distributions for flare rise time and decay time are 3.5 min and 14.8 min, respectively. These time values for stellar flares are similar to the time-scale of solar flares, which supports the idea that stellar flares and solar flares have the same physical mechanism. The statistical results obtained in this work for SLS can be a benchmark of flare characteristic times when comparing with other types of stars. Copyright © 2021, The Authors. All rights reserved.

关键词： Stars

来源：评论

学校读者我要写书评

暂无评论

[email protected] mineralized MOF as a sensing immunoprobe in detection of aflatoxin B 1

引用

Biosensors and Bioelectronics 2023年 220卷

作者： Xiaoning Liao Xue Zhang Wenjun Wang Chanjuan Liu Wuying Yang Dan Wang Research Center of Mycotoxins Jiangxi Agricultural University Nanchang 330045 China Jiangxi Key Laboratory for Postharvest Technology and Nondestructive Testing of Fruits & Vegetables/Collaborative Innovation Center of Postharvest Key Technology and Quality Safety of Fruits &Vegetables in Jiangxi Province Jiangxi Agricultural University Nanchang 330045 China Key Lab for Agro-product Processing and Quality Control of Nanchang City College of Food Science and Engineering Jiangxi Agricultural University Nanchang 330045 China Agricultural Biotechnology Analysis and Testing Center Jiangxi Agricultural University Nanchang 330045 China

Nanobody(Nb) is too small to carry more signal reporters, which often leads to low sensitivity in immunoassay. Herein, we proposed a novel immunoprobe integration of Nb and biomimetic mineralized metal-organic frameworks(MOF), in which plenty of succinylated horseradish peroxidase(sHRP) were encapsulated within a single MOF and the Nb was assembled on the biomimetic mineralized MOF. It overcomes the dilemma that the Nb is difficult to carry more signal reporters. Meanwhile, the mineralized MOF can protect the sHRP from denaturation and facilitate the transport of substrates to the active sites of sHRP. Electrosensing of aflatoxin B 1 (AFB 1 ) was realized with a competitive format in which the target AFB 1 and immobilized artificial antigen were competing for binding with the immunoprobe. Additionally, the detection signal was enlarged by the catalysis of this immunoprobe to 4-chloro-1-naphthol for producing precipitations, which blocked the channels of the immunoprobe and the redox probes of Fe(CN) 6 3−/4− was difficult to reach the electrode surface through the channels. Hence, the as-prepared immunosensor exhibited good voltammetry responses towards the determined AFB 1 in a linear range of 50.0 fg/mL - 20.0 ng/mL with a detection limit of 20.0 fg/mL. The specificity, stability, and reproducibility of this immunosensor were satisfactory. This work may provide an alternative idea for the application of Nb in immunoassay, and the idea may also be applicable to other bio-recognition elements for immunoassay.

关键词： Nanobody Aflatoxin B 1 Immunoprobe Immunoassay Biomimetic mineralization of MOF

来源：评论

学校读者我要写书评

暂无评论

Study of Ds1(2460)+→Ds+π+π- in B→D‾(*)Ds+π+π- decays

引用

science Bulletin 2025年第9期70卷 1432-1444页

作者： Aaij, R. Abdelmotteleb, A.S.W. Beteta, C.Abellan Abudinén, F. Ackernley, T. Adefisoye, A.A. Adeva, B. Adinolfi, M. Adlarson, P. Agapopoulou, C. Aidala, C.A. Ajaltouni, Z. Akar, S. Akiba, K. Albicocco, P. Albrecht, J. Alessio, F. Alexander, M. Aliouche, Z. Cartelle, P.Alvarez Amalric, R. Amato, S. Amey, J.L. Amhis, Y. An, L. Anderlini, L. Andersson, M. Andreianov, A. Andreola, P. Andreotti, M. Andreou, D. Anelli, A. Ao, D. Archilli, F. Argenton, M. Cuendis, S.Arguedas Artamonov, A. Artuso, M. Aslanides, E. Da Silva, R.Ataíde Atzeni, M. Audurier, B. Bacher, D. Perea, I.Bachiller Bachmann, S. Bachmayer, M. Back, J.J. Rodriguez, P.Baladron Balagura, V. Balboni, A. Baldini, W. Balzani, L. Bao, H. de Souza Leite, J.Baptista Pretel, C.Barbero Barbetti, M. Barbosa, I.R. Barlow, R.J. Barnyakov, M. Barsuk, S. Barter, W. Bartolini, M. Bartz, J. Basels, J.M. Bashir, S. Bassi, G. Batsukh, B. Battista, P.B. Bay, A. Beck, A. Becker, M. Bedeschi, F. Bediaga, I.B. Behling, N.B. Belin, S. Belous, K. Belov, I. Belyaev, I. Benane, G. Bencivenni, G. Ben-Haim, E. Berezhnoy, A. Bernet, R. Andres, *** Bertolin, A. Betancourt, C. Betti, F. Bex, J. Bezshyiko, Ia. Bhom, J. Bieker, M.S. Biesuz, N.V. Billoir, P. Biolchini, A. Birch, M. Bishop, F.C.R. Bitadze, A. Bizzeti, A. Blake, T. Blanc, F. Blank, J.E. Blusk, S. Bocharnikov, V. Boelhauve, J.A. Garcia, O.Boente Boettcher, T. Bohare, A. Boldyrev, A. Bolognani, C.S. School of Physics and Astronomy Monash University Melbourne Australia Rio de Janeiro Brazil Rio de Janeiro Brazil Department of Engineering Physics Tsinghua University Beijing China Beijing China School of Physics State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China University of Chinese Academy of Sciences Beijing China Institute of Particle Physics Central China Normal University Hubei Wuhan China San Jose Costa Rica Université Savoie Mont Blanc CNRS AnnecyIN2P3-LAPP France Université Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand France Gif-Sur-Yvette France Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France Université Paris-Saclay CNRS/IN2P3 IJCLab Orsay France Laboratoire Leprince-Ringuet CNRS/IN2P3 Ecole Polytechnique Institut Polytechnique de Paris Palaiseau France LPNHE Sorbonne Université Paris Diderot Sorbonne Paris Cité CNRS/IN2P3 Paris France I. Physikalisches Institut RWTH Aachen University Aachen Germany Universität Bonn-Helmholtz-Institut für Strahlen und Kernphysik Bonn Germany Technische Universität Dortmund Fakultät Physik Dortmund Germany Physikalisches Institut Albert-Ludwigs-Universität Freiburg Freiburg Germany Heidelberg Germany Ruprecht-Karls-Universität Heidelberg Physikalisches Institut Heidelberg Germany School of Physics University College Dublin Dublin Iceland INFN Sezione di Bari Bari Italy INFN Sezione di Bologna Bologna Italy INFN Sezione di Ferrara Ferrara Italy INFN Sezione di Firenze Firenze Italy INFN Laboratori Nazionali di Frascati Frascati Italy INFN Sezione di Genova Genova Italy INFN Sezione di Milano Milano Italy INFN Sezione di Milano-Bicocca Milano Italy INFN Sezione di Cagliari Monserrato Italy INFN Sezione di Padova Padova Italy INFN Sezione di Perugia Perugia Italy INFN Sezione di Pisa Pisa Italy INFN Sezione di Roma La Sapienza Roma Italy INFN Sezione di Roma Tor Vergata Roma Italy Nikhef National Institute for Subatomic Physi

An amplitude analysis of the Ds1(2460)+→Ds+π+π- transition is performed simultaneously in B0→D-Ds+π+π-, B+→D‾0Ds+π+π-, and B0→D*-Ds+π+π- decays. The study is based on a data sample of proton-proton collisions recorded with the LHCb detector at centre-of-mass energies of s=7,8, and 13 TeV, corresponding to a total integrated luminosity of 9fb-1. A clear double-peak structure is observed in the m(π+π-) spectrum of the Ds1(2460)+→Ds+π+π- decay. The data can be described either with a model including f0500,f0980, and f2(1270) resonances, in which the contributions of f0(980) and f2(1270) are unexpectedly large, or with a model including f0(500), a doubly charged open-charm tetraquark state Tcs¯++ and its isospin partner Tcs¯0. If the former is considered implausible, the Tcs¯ states are observed with high significance, and the data are consistent with isospin symmetry. When imposing isospin constraints between the two Tcs¯ states, their mass and width are determined to be (2327±13±13) MeV and (96±16-23+170) MeV, respectively, where the first uncertainty is statistical and the second is systematic. The mass is slightly below the DK threshold, and a spin-parity of 0+ is favoured with high significance. © 2025 science China Press

关键词： Colliding beam accelerators

来源：评论

学校读者我要写书评

暂无评论

Carburized Layer Cracking analysis of Counterweight Blocks of Speed Controller

引用

Journal of Physics: Conference Series 2021年第1期2101卷

作者： Tao Jiang Bing Zhang Yimeng Mao Jiale Cheng Xiaodong Shi AECC Beijing Institute of Aeronautical Materials Beijing 100095 China Failure Analysis Center of Aviation Industry Corporation of China Beijing 100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing 100095 China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing 100095 China Key Laboratory of Science and Technology on Aeronautical Materials Testing and Evaluation Aero engine corporation of China Beijing 100095 China New Era Engineering Consulting Co. Ltd. Beijing 100088 China

Trace and fracture analysis, metallographic examination, residual stress testing, and material analysis were carried out, coupled with examining the failure timeline, to analyze the cracking problem of 12CrNi3A steel counterweight blocks under multi-factor coupling. The results show that the cracks of the counterweight blocks are intergranular microcracks in the carburized layer and they are delayed cracks under the joint action of microstructure stress, grinding stress and hydrogen. The delayed cracking of the counterweight blocks is mainly related to abnormal hydrogen absorption during surface treatment and poor grinding quality. The obvious microstructure segregation in raw material and the thicker carburized layer promoted the cracking. The following measures should be comprehensively taken to prevent such failure: strictly controlling raw material quality, hydrogen absorption and stress, as well as increasing the processes to remove hydrogen, reduce stress and stabilize microstructure.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Research on Dynamic Maintenance Strategy of Complex Equipment System

Research on Dynamic Maintenance Strategy of Complex Equipmen...

引用

Prognostics and System Health Management (PHM-Jinan), International Conference on

作者： Yingshun Li Aina Wang Xiaojian Yi Key Laboratory of Intelligent Control and Optimization for Industrial Equipment of Ministry of Education Dalian University of Technology Dalian China The School of Mechatronical Engineering Beijing Institute of Technology Beijing China Chinese Academy of Sciences China North Vehicle Research Institute & Academy of Mathematics and Systems Science Beijing China

ISBN: (数字)9781728151816

ISBN: (纸本)9781728151823

In recent years, the complex equipment system presents the rapid development of integration and intelligence, and it is easy to break down when it works in bad environment for a long time. The maintenance support ability and comprehensive maintenance economic benefit of the complex equipment system play an important role in the defense ability. Therefore, in order to improve the combat readiness of equipment, solve the current situation of economic loss and low operation ability caused by insufficient or excessive maintenance. In this paper, a dynamic maintenance strategy for complex equipment system is proposed. The goal of this maintenance strategy is to minimize the average cost in a short period of time,to update the running state of the system and the execution time of fault maintenance in real time. Finally, the effectiveness of the dynamic maintenance strategy proposed in this paper is verified by the analysis of maintenance model parameters. The dynamic maintenance strategy proposed in this paper considers the operation state and economic cost of complex equipment system, which is more applicable to practical engineering application.

关键词： Maintenance engineering Real-time systems Degradation Decision making Economics Correlation Optimization

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：