期刊文献+
共找到5,384篇文章
< 1 2 250 >
每页显示 20 50 100
Facing the globalization of China's agricultural development
1
作者 LIU Rui LIU Chang 《Journal of Northeast Agricultural University(English Edition)》 CAS 2007年第2期188-192,共5页
This article discussed what economic globalization had brought to China's agricultural development and how to deal with the globalization of China's agricultural development after China's entry into WTO. This study... This article discussed what economic globalization had brought to China's agricultural development and how to deal with the globalization of China's agricultural development after China's entry into WTO. This study expounded our opportunities and challenges under the new circumstance of China's accession to WTO on the agriculture and gave some measures to reduce the unfavorable impacts on the agriculture 展开更多
关键词 GLOBALIZATION china's agricultural development WTO
在线阅读 下载PDF
ON THE DIFFERENTIATION OF THE ECONOMIC DEVELOPMENT OF CHINA’S NORTH,CENTRAL & SOUTH COASTAL REGIONS
2
作者 Wu Zhe geography, SHANXI NORMAL UNIVERSITY 《南开经济研究》 CSSCI 北大核心 1994年第S3期19-24,39,共7页
Ⅰ. An analysis of the development trend of the economy in the north,middle aud south coastal regions or China since China began to implementreform and open
关键词 S NORTH CENTRAL SOUTH COASTAL REGIONS ON the DIFFERENTIATION of the ECONOMIC development of china GDP THAN
在线阅读 下载PDF
Development of antiinflammatory agents and immunopharmacology in the People’s Republic of China
3
《中国药理学通报》 CAS CSCD 北大核心 1989年第5期-,共7页
With the rapid advance of academic activities in the field of phar-macology,antiinflammatory and immunopharmacology has become abranch of pharmacology in our country.Under professor Zhou Jin-huang’s charge and concer... With the rapid advance of academic activities in the field of phar-macology,antiinflammatory and immunopharmacology has become abranch of pharmacology in our country.Under professor Zhou Jin-huang’s charge and concerns,the first national conference of anti-inflammatory and immunopharmacology was held at Huang Shan in1982.In following years,the frist training class for antiinflamma-tory and immunopharmacological studies was conducted in Hefei. 展开更多
关键词 development of antiinflammatory agents and immunopharmacology in the People s Republic of china
在线阅读 下载PDF
Comparison and Inspiration of the Theme of Relationship between Human Beings and Nature in the Field of Literature between China and the West
4
作者 Ren Jiong 《学术界》 CSSCI 北大核心 2015年第4期298-302,共5页
The relationship between human beings and nature influences the expressions and manifestations of literature. Literature can spy on the nature exploration of human society and ideological values in the thinking and be... The relationship between human beings and nature influences the expressions and manifestations of literature. Literature can spy on the nature exploration of human society and ideological values in the thinking and behavior patterns,expressing the relationship between human beings and nature. Through expressions of literature in China and the West,we draw lessons from W estern literary expressions in the developing relationship between man and nature,and get inspiration for the development of Chinese literature. 展开更多
关键词 人与自然 文学 西方 中国 行为模式 人类社会 价值观
在线阅读 下载PDF
On Chinese Traditional Culture from the Perspective of Cultural Exchange between China and the West
5
作者 Cao Guihua 《学术界》 CSSCI 北大核心 2017年第7期302-310,共9页
With the strengthening of globalization and closer ties between countries,all-round exchanges and cooperation have become an inevitable trend.In the new era,the cultural exchange between China and the West presents an... With the strengthening of globalization and closer ties between countries,all-round exchanges and cooperation have become an inevitable trend.In the new era,the cultural exchange between China and the West presents an unprecedented depth and breadth.Chinese traditional culture,which has made great contributions to Oriental culture and even the world culture,has been developed,in the process of constant conflict,digestion,and absorption while entering other countries in the world.The inclusiveness of Chinese traditional culture has made it survive and thrive in absorbing the quintessence of foreign culture,which makes it contain new contents.In the process of Chinese and Western cultural exchanges,some parts of the essence traditional Chinese culture which are ignored should be given certain inclination in policy and guided by strengthening the education of Chinese traditional culture. 展开更多
关键词 中国传统文化 文化交流 西方 世界文化 东方文化 外来文化 全球化 包容性
在线阅读 下载PDF
EBD Methodology in the Education in the Mid-west University of China
6
作者 Yi Hong Deng Xiaoguang 《学术界》 CSSCI 北大核心 2017年第1期303-308,共6页
Due to the impact of globalization,more and more universities in China dedicate to improve the quality of undergraduate education.The particular emphasis was given on the universities in Mid-west university of China,w... Due to the impact of globalization,more and more universities in China dedicate to improve the quality of undergraduate education.The particular emphasis was given on the universities in Mid-west university of China,where the economics and transportation facility are relatively less developed comparing to other regions.In contrast of the traditional methodologies of social science,this research was conducted using an engineering design methodology,called Environment-Based Design(EBD).The EBD procedure allows to derive the solutions step-by-step based on a holistic environment analysis and thus an identification of major challenges. 展开更多
关键词 中国中西部 教育系统 高校 工程设计方法 教育质量 交通设施 传统方法 社会科学
在线阅读 下载PDF
THE ACHIEVEMENT AND DEVELOPMENTOF CHINESE MINING GEOLOGY
7
作者 Wang Yishui Peng Gong Li Suiyuan(China National Nonferrous Metals Industry Corproation, Beijing 100088, China) 《Journal of Central South University》 SCIE EI CAS 1996年第1期104-106,共3页
The mining geological work had been conducted in China since the ancient time. From 14 th to 18 th century, the output of iron mine reached to 6450 t annually. During 1763 to 1773, the annual output of copper in Yunna... The mining geological work had been conducted in China since the ancient time. From 14 th to 18 th century, the output of iron mine reached to 6450 t annually. During 1763 to 1773, the annual output of copper in Yunnan Province was 9200 t. In modern time, Chinese mining industry grew slowly. However, in 1950′s the mining geological organization were established in each administrative department and its affiliated mining companies. A set of regulations had also been established systematically. The mining geology has made the great contribution to reserve the mineral resources and to raise the economical benefit. Now resources have been found in many mine sites. The tasks facing us in future are to look for new deposits for old mine companies which are in shortage of resources and extend their service period; to involve in research for improv ing mining operational parameters and raise the economic benefit; to develop the technical market, and to provide service for development of mining industry reling on science and technology progress. 展开更多
关键词 MininG GEOLOGY RESOURCES development china〖WT5BZ
在线阅读 下载PDF
Geochronology, petrogenesis and tectonic significance of Dahongliutan pluton in Western Kunlun orogenic belt, NW China 被引量:12
8
作者 DING Kun LIANG Ting +5 位作者 YANG Xiu-qing ZHOU Yi FENG Yong-gang LI Kan TENG Jia-xin WANG Rui-ting 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第12期3420-3435,共16页
The Dahongliutan granitic pluton,in the eastern part of the West Kunlun orogenic belt,provides significant insights for studying the tectonic evolution of West Kunlun.This paper presents a systematic study of LA-ICP-M... The Dahongliutan granitic pluton,in the eastern part of the West Kunlun orogenic belt,provides significant insights for studying the tectonic evolution of West Kunlun.This paper presents a systematic study of LA-ICP-MS zircon U Pb age,major and trace elements,Sr-Nd-Hf isotopes,and the first detailed Li isotope analysis of the Dahongliutan pluton.LA-ICP-MS zircon U Pb dating shows that the Dahongliutan granites were emplaced in the Late Triassic((213±2.1)Ma).Geochemical data show relatively high SiO2 contents(68.45 wt%73.62 wt%)and aluminum saturation index(A/CNK=1.111.21)indicates peraluminous high-K calc-alkaline granite.The Dahongliutan granites are relatively high in light rare earth elements(LREE)and large ion lithophile elements(LILEs)(e.g.,Rb,K,Th),and relatively depleted in high field strength elements(HFSEs)(e.g.,Nb,Ta,P,Ti).TheεNd(t)values range from 8.71 to 4.73,and(87Sr/86Sr)i=0.70870.71574.Zircons from the pluton yield 176Hf/177Hf values of 0.2826181 to 0.2827683,andεHf(t)values are around 0;the two-stage Hf model ages range from 0.974 to 1.307 Ga.Theδ7Li values are 0.76‰3.25‰,with an average of 2.53‰.Isotopic compositions of the pluton suggest a mixed trend between the partial melting of the Middle Proterozoic ancient crustal material and a juvenile mantle-derived material.This study infers that the Dahongliutan rock mass is formed in the post-collisional extension environment,when the collision between South Kunlun and the Tianshuihai terranes results in the closure of the Palaeo-Tethys.The mantle-derived magma results in partial melting of the lower crust. 展开更多
关键词 LA-ICP-MS zircon U Pb age petrogeochemistry Li-Sr-Nd-Hf isotopic composition Dahongliutan pluton west Kunlun orogen china
在线阅读 下载PDF
ABRUPT CHANGE OF LAKE ENVIRONMENT IN WEST CHINA: AN EVIDENCE FOR GLOBAL CLIMATE WARMING
9
作者 Li Shijie, Shi Yafeng, Li Wanchun, Wu Jinglu, Yin Yu, Yang Xiangdong,Xia Weilan 《地学前缘》 EI CAS CSCD 2000年第S1期375-376,共2页
Expanding or shrinking of lakes, especially in the closed basin, directly reflects the balance situation of water\|heat regime in the catchment. Fluctuations of the water\|level can be used as an indicator of climatic... Expanding or shrinking of lakes, especially in the closed basin, directly reflects the balance situation of water\|heat regime in the catchment. Fluctuations of the water\|level can be used as an indicator of climatic and environmental changes. Authors have investigated many lakes in West China in recent years, including lakes in the Tibet Plateau and in the arid area in the northwest China. We found that all lakes have been in shrinkage, some of them were changed into swamp and some dried dramatically up, which caused the abrupt change of the lake environment. This change led the grassland to be retrogression and desertification, and made the eco\|environment deterioration in West China.The Xingcuo Lake, in the height of 3425m ASL with 29km\+2 drainage area, located in the Zoige Basin, Northeastern Tibet Plateau, had changed into swamp in the area of 2km\+2 , and the vast area of peripheral marsh changed into grassland by the years of 1990. But the topographic map in the scale of 1/100000 and aerial photography surveyed at the end of 1960’s show clearly that this lake was in the area of 3 3km\+2 and surrounded by vast area of marshland. In the north central part of the Tibet Plateau, the Gourencuo Lake, in the height of 4650m ASL, was in the area of 23 5km\+2 with the average water depth of 1 3m in 1990. Then a dramatic change had been appearing in the recent years. When authors went there again in 1998,they found that the lake dried fully up. A thin salt crystal layer with saturated brine covered the flat central lake floor. This means that at least 30×10 6 m 3 water volume stored in the lake had been lost by the evaporation in 8 years, and many sand dunes had been formed. This abrupt change of lake environment could be recognized as the result of natural process or climate warming because of no human activity there. 展开更多
关键词 ABRUPT change LAKE environment west china CLIMATE WARMinG
在线阅读 下载PDF
Development and Research Center of China Geological Survey
10
《中国地质》 CAS CSCD 北大核心 2018年第A01期124-124,共1页
IntroductionAs a public institution directly affiliated to China Geological Survey, the DevelopmentResearch Center of China Geological Survey mainly undertakes the work for geologicalsurvey, development research, IT-a... IntroductionAs a public institution directly affiliated to China Geological Survey, the DevelopmentResearch Center of China Geological Survey mainly undertakes the work for geologicalsurvey, development research, IT-applied development and management support. It is alsoresponsible for accepting and safekeeping the geological archives and relevant service aswell as providing business support, technical guidance and related research on the strategicactions of ore-prospecting breakthrough. 展开更多
关键词 development china GEOLOGICAL SURVEY
在线阅读 下载PDF
Development of Distance Education in China
11
《开放教育研究》 1995年第1期45-48,共4页
The advancement of human society and the development of economy and modern science and technologyhas shortenedthedlstancebetween us and confronted us with chilllenges and probkinB Ofthlltllallty Of Wb1Ch
关键词 development of Distance Education in china
在线阅读 下载PDF
Research on Legal System of China Renewable Energy Development Fund
12
作者 Wu Yu Bian Yongmin 《学术界》 CSSCI 北大核心 2015年第9期257-262,共6页
This paper intends to analyze legal system of the Renewable Energy Development Fund based on the relevant provisions of Interim Procedures for the Administration of the Collection and Use of the Renewable Energy Devel... This paper intends to analyze legal system of the Renewable Energy Development Fund based on the relevant provisions of Interim Procedures for the Administration of the Collection and Use of the Renewable Energy Development Fund in November 2011.This governmental fund system combines government macro-control with market regulation,using two hands of administration and market.However,the specific rules have system defects for the lack of support by Tradable Green Certificates.In order to improve and guarantee the development of renewable energy,the legal system of the Renewable Energy Development Fund needs further improving. 展开更多
关键词 可再生能源 基金管理 法律制度 市场调节 宏观调控 制度缺陷 绿色证书 政府
在线阅读 下载PDF
西部大开发与制造业信息化The West Ch 被引量:3
13
作者 孙林岩 赵沂蒙 +2 位作者 王端民 徐和平 陈刚 《中国机械工程》 EI CAS CSCD 北大核心 2001年第1期20-23,共4页
推动制造业发展是实施西部大开发战略的关键举措之一。分析制造业信息化对西部地区发展的战略意义 ,以及信息化对西部制造业发展的作用机理 ,提出西部制造业信息化的主要实施对策。
关键词 制造业 西部大开发 发展战略
在线阅读 下载PDF
New Development in Global Politics and Rethinking on China's Multilateral Diplomacy
14
作者 CHEN Dongxiao Vice President of Shanghai Institutes for International Studies,Dr 《国际展望》 2010年第1期1-21,95,共22页
The new developments in global politics exert three systemic impacts on international relations. Global issues, vital to the survival of mankind, rise to the top agenda of national governments. The epicenter of global... The new developments in global politics exert three systemic impacts on international relations. Global issues, vital to the survival of mankind, rise to the top agenda of national governments. The epicenter of global power is shifting from U.S. and Europe to the rest of the regions. The global "political excitement and zeal" is rolling on. All exact more on the competence of global governance. The current international multilateral mechanisms are in "competence deficit", worsening either in terms of adequacy, validity or legitimacy. The call for the reform of it is ever soaring. China by the way is at once engaging in the multilateral diplomacy transforming the international system and facing the growing pressure of assuming "leadership" and "international responsibility". China needs to continuously adapt to the changed national identity in the multilateral diplomacy, to reconcile the multilateral mechanisms that deal with regions and domains in China's strategic planning and laying-out, to organically associate the short-term and long-term goals and to upgrade the concept of harmonious world in the practice of multilateral diplomacy. 展开更多
关键词 New development in Global Politics and Rethinking on china’s Multilateral Diplomacy
在线阅读 下载PDF
GUO BOSHENG,PIONEER FOR DEVELOPING RARE EARTH APPLICATION IN AGRICULTURE IN CHINA
15
《有色金属》 CSCD 1990年第4期73-74,共2页
Guo Bosheng, senior engineer/professor, is now a member of the Expert Group of the State Council Rare Earth Leading Group, PRC., director of Rare Earth Development Center for Agricultural Technique. He graduated from ... Guo Bosheng, senior engineer/professor, is now a member of the Expert Group of the State Council Rare Earth Leading Group, PRC., director of Rare Earth Development Center for Agricultural Technique. He graduated from Moscow Fine Chemical Industry University in the Sovi- 展开更多
关键词 PRC GUO BOSHENG PIONEER FOR DEVELOPinG RARE EARTH APPLICATION in AGRICULTURE in china
在线阅读 下载PDF
中国非常规油气资源效益开发面临的挑战与对策 被引量:7
16
作者 何希鹏 张培先 +5 位作者 高玉巧 汪凯明 何贵松 任建华 高全芳 臧素华 《中国石油勘探》 北大核心 2025年第1期28-43,共16页
通过深入调研国内外非常规油气在勘探开发、关键技术及运行模式等方面的差异性,结合国内非常规油气勘探开发现状,提出了中国非常规油气产业主要面临资源战略接替、开发关键技术、管理体制机制、数字化智能化绿色化建设等挑战。借鉴北美... 通过深入调研国内外非常规油气在勘探开发、关键技术及运行模式等方面的差异性,结合国内非常规油气勘探开发现状,提出了中国非常规油气产业主要面临资源战略接替、开发关键技术、管理体制机制、数字化智能化绿色化建设等挑战。借鉴北美“页岩革命”的经验启示,聚焦资源、技术、管理、成本、效益等关键要素,研究提出了推动中国非常规油气效益开发的5项对策建议:(1)全领域战略谋划,加强发展战略的顶层设计,做优国内资源阵地,扩大海外资源市场,进一步夯实非常规油气规模开发的资源基础。(2)全生命周期评价,单井长期试采,摸清生产规律,强化重点试验井组评价,建模数模一体化研究,落实开发技术政策,提高单井产量和油气田采收率。(3)全链条技术迭代,以问题和目标为导向,攻克效益开发关键核心技术,高效推动非常规示范区建设,集成可推广可复制的做法,全面推进非常规效益开发。(4)全要素资源统筹,推进四个一体化、多元合作及市场化运作模式,实现提产提效和互惠共赢,增强非常规油气开发活力。(5)全过程绿色智能,构建大科研体系、大运营体系和大环保体系,打造非常规油气产业发展新格局。5项对策旨在推动中国非常规油气资源早日实现规模效益开发,确保国内油气产业持续高质量发展,践行端牢能源饭碗的重大责任使命。 展开更多
关键词 非常规油气 效益开发 挑战 对策建议 中国
在线阅读 下载PDF
Ningaloo Niño/Niña对华西秋雨异常的影响
17
作者 吴越 王顺久 +1 位作者 张绿夷 于浩慧 《气候与环境研究》 CSCD 北大核心 2024年第2期167-177,共11页
利用1979~2016年NOAA海表温度资料、NCEP/NCAR大气再分析资料以及CN05.1降水资料,首次研究了Ningaloo Niño/Niña与华西秋雨异常的联系,揭示了Ningaloo Niño/Niña与华西秋雨的响应关系。研究表明:1)在Ningaloo Ni... 利用1979~2016年NOAA海表温度资料、NCEP/NCAR大气再分析资料以及CN05.1降水资料,首次研究了Ningaloo Niño/Niña与华西秋雨异常的联系,揭示了Ningaloo Niño/Niña与华西秋雨的响应关系。研究表明:1)在Ningaloo Niño/Niña年秋季,副热带东印度洋地区海温将发生明显变化,在扣除ENSO信号影响后,Ningaloo Niño/Niña会导致华西秋雨雨量的变化,在Ningaloo Niño年雨量增多而在Ningaloo Niña年雨量减少。2)Ningaloo Niño(Niña)年秋季,副热带东印度洋地区海温升高(降低),致使南北半球中低纬经向环流异常进而导致华西地区上升(下沉)气流增强,南海地区向华西地区的水汽辐合增强(减弱),与此同时,赤道附近的纬向环流异常与北半球低纬到中高纬的经向环流异常联系紧密,导致欧亚大陆中高纬地区环流经向度加大(减小),为华西秋雨的增加(减少)提供了有利条件。研究成果可为华西秋雨预测提供新的思路。 展开更多
关键词 Ningaloo Niño/Niña 华西秋雨 年际变化 气候变化
在线阅读 下载PDF
中国天然气开发形势与远景展望 被引量:2
18
作者 贾爱林 王国亭 李易隆 《天然气工业》 北大核心 2025年第5期31-42,共12页
世界能源结构正加速向绿色低碳转型,天然气是绿色低碳能源的典型代表,将持续在能源结构转型中发挥关键作用。为进一步明确中国天然气的开发形式与发展远景,总结了全球天然气发展当前所具有的主要特征,在此基础上重点剖析了国内最大的天... 世界能源结构正加速向绿色低碳转型,天然气是绿色低碳能源的典型代表,将持续在能源结构转型中发挥关键作用。为进一步明确中国天然气的开发形式与发展远景,总结了全球天然气发展当前所具有的主要特征,在此基础上重点剖析了国内最大的天然气生产企业中石油的天然气开发历程、资源现状及勘探开发潜力,最后采用重点解剖、情景分析与整体预测的方法,分析和展望了全国天然气发展远景。研究结果表明:①中国天然气探明率整体偏低,预测2060年常规气、致密气、页岩气及煤层(岩)气4类天然气的新增天然气探明储量可达到目前天然气探明储量的近2倍,天然气资源探明率的持续提升是天然气长期发展的根基;②2060年新增天然气经济可采储量可达目前剩余经济可采储量的近2.5倍,采收率的持续提高是天然气长期稳产的关键;③2030年中国天然气产量可上产至3000×10^(8)m^(3)以上,至2045年产量可达到3750×10^(8)m^(3),并可持续稳产至2060年;④全球天然气目前主要发展特征为能源结构绿色低碳化支撑、储产量非均衡分布、非常规成为供应主力、需求将保持增长等。结论认为,所提出的目标和方向分析较为客观和合理,可以为天然气发展宏观政策制定、天然气发展研究等提供借鉴和参考,也可为中国天然气长期规划发展、中国能源结构分析提供重要参考。 展开更多
关键词 世界天然气 能源结构转型 绿色低碳 中国天然气 开发形势 发展远景
在线阅读 下载PDF
南方丘陵山地油菜和小麦播种机械化发展现状与趋势 被引量:4
19
作者 廖宜涛 施彬彬 +3 位作者 王传奇 廖庆喜 武安阳 欧耀徽 《农业工程学报》 北大核心 2025年第1期12-26,共15页
中国南方丘陵山地油菜和小麦的机械化生产是解决南方地区冬闲田难题的有效途径,也是保障国内粮油安全的重要措施,但受地形条件和种植模式影响,目前南方丘陵山地油菜、小麦机械化播种水平较低且发展缓慢,仍处于“无机可用”或“无好机可... 中国南方丘陵山地油菜和小麦的机械化生产是解决南方地区冬闲田难题的有效途径,也是保障国内粮油安全的重要措施,但受地形条件和种植模式影响,目前南方丘陵山地油菜、小麦机械化播种水平较低且发展缓慢,仍处于“无机可用”或“无好机可用”状态。该文从生产区划、应用场景、技术装备3个方面分析了南方丘陵山地油菜小麦机械化生产现状,通过梳理油菜和小麦典型生产场景与实际应用机具之间的矛盾,明确了湿黏稻茬土壤、复杂丘坡地形、油菜和小麦种植农艺要求、区域经济落后、经营主体倾向和技术市场空缺等是影响南方丘陵山地各油麦产区机械化播种发展水平不充分的主要因素;通过分析现阶段油菜小麦机械化播种装备应用、技术发展及南方丘陵山地油麦机械化播种的技术卡点和装备发展需求,提出了研发适应南方丘陵山地黏重湿烂土壤条件、丘坡地形和小地块播种的智能化油麦兼用联合直播机是提高油麦机播水平的装备基础,并明确黏重与湿烂土壤种床整备、丘陵山地起伏地表播深控制、油麦兼用精量排种、智能化播种控制等关键技术是研究重点。研究可为南方丘陵山地油菜、小麦机械化播种水平提升提供参考。 展开更多
关键词 南方丘陵山地 油菜 小麦 机械化播种 发展现状 趋势
在线阅读 下载PDF
美丽园区建设的路径研究 被引量:1
20
作者 陈吕军 严坤 田金平 《生态经济》 北大核心 2025年第1期44-51,共8页
建设美丽中国是全面建设社会主义现代化国家、实现中华民族永续发展的重要举措。中国工业园区历经四十多年发展历程,已经成为建设实体经济、引领区域发展的先行者,目前已聚集全国80%的工业企业,推动工业园区建设成为人与自然和谐共生的... 建设美丽中国是全面建设社会主义现代化国家、实现中华民族永续发展的重要举措。中国工业园区历经四十多年发展历程,已经成为建设实体经济、引领区域发展的先行者,目前已聚集全国80%的工业企业,推动工业园区建设成为人与自然和谐共生的美丽园区,对我国生态文明建设意义重大。论文回顾了中国工业园区的发展历程,面向新发展阶段存在的新挑战和新机遇,提出了工业园区在新时代需承担的高质量发展使命任务。在此基础上,本文针对园区社会、经济、自然三个子系统,从六个方面解析并详细阐述了中国工业园区打造美丽园区、支撑美丽中国建设的关键内涵。进一步地,根据国家对美丽中国建设提出的目标和计划,结合我国生态工业园区发展过程中形成的实践经验,从八个维度提出工业园区推进美丽中国建设的关键行动,支撑工业园区生态文明建设和美丽中国行动。 展开更多
关键词 美丽中国 工业园区 美丽园区 绿色发展 生态文明
在线阅读 下载PDF
上一页 1 2 250 下一页 到第
使用帮助 返回顶部