首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   62624篇
  免费   1820篇
  国内免费   741篇
管理学   1996篇
劳动科学   10篇
民族学   905篇
人才学   13篇
人口学   744篇
丛书文集   7951篇
理论方法论   2553篇
综合类   45878篇
社会学   3260篇
统计学   1875篇
  2024年   118篇
  2023年   397篇
  2022年   502篇
  2021年   654篇
  2020年   834篇
  2019年   820篇
  2018年   768篇
  2017年   939篇
  2016年   1010篇
  2015年   1301篇
  2014年   3129篇
  2013年   3972篇
  2012年   3967篇
  2011年   4580篇
  2010年   3672篇
  2009年   3728篇
  2008年   3907篇
  2007年   4707篇
  2006年   4738篇
  2005年   4234篇
  2004年   3934篇
  2003年   3876篇
  2002年   3195篇
  2001年   2726篇
  2000年   1475篇
  1999年   455篇
  1998年   268篇
  1997年   193篇
  1996年   169篇
  1995年   127篇
  1994年   99篇
  1993年   100篇
  1992年   82篇
  1991年   84篇
  1990年   39篇
  1989年   75篇
  1988年   20篇
  1987年   27篇
  1986年   27篇
  1985年   29篇
  1984年   62篇
  1983年   38篇
  1982年   41篇
  1981年   11篇
  1980年   17篇
  1979年   18篇
  1978年   14篇
  1977年   3篇
  1976年   1篇
  1975年   3篇
排序方式: 共有10000条查询结果,搜索用时 16 毫秒
71.
当前,影响和制约中国电子商务进一步发展的主要问题集中表现在“信用缺失”问题上,它导致人们对网上交易仍心存疑虑,物流配送滞后,商品流通不畅,企业计算机应用水平不高,高水平网络人才匮乏,与电子商务相关的法规体制不够健全。为此,中国电子商务必须建立诚信长效机制,加快物流配送体系建设,构筑有效的社会物流配送系统.加快推广电子商务知识,强化电子商务人才培养,健全与国际接轨的电子商务法律体系。  相似文献   
72.
It is becoming increasingly clear that scientists, managers, lawyers, public policymakers, and the public must decide how to value what is provided by, and is a consequence of, natural resources. While “Western” scientists have clear definitions for the goods and services that ecosystems provide, we contend that these categories do not encompass the full totality of the values provided by natural resources. Partly the confusion results from a limited view of natural resources derived from the need to monetize the value of ecosystems and their component parts. Partly it derives from the “Western” way of separating natural resources from cultural resources or values, and partly it derives from the false dichotomy of assuming that ecosystems are natural, and anything constructed by man is not natural. In this article, we explore the previous assumptions, and suggest that because cultural resources often derive from, and indeed require, intact and unspoiled natural ecosystems or settings, that these values are rightly part of natural resources. The distinction is not trivial because of the current emphasis on cleaning up chemically and radiologically contaminated sites, on restoration of damaged ecosystems, on natural resource damage assessments, and on long‐term stewardship goals. All of these processes depend upon defining natural resources appropriately. Several laws, regulations, and protocols depend upon natural resource trustees to protect natural resources on trust lands, which could lead to the circular definition that natural resources are those resources that the trustees feel they are responsible for. Where subsistence or tribal peoples are involved, the definition of natural resources should be broadened to include those ecocultural attributes that are dependent upon, and have incorporated, natural resources. For example, a traditional hunting and fishing ground is less valued by subsistence peoples if it is despoiled by contamination or physical ecosystem degradation; an Indian sacred ground is tarnished if the surrounding natural environment is degraded; a traditional homeland is less valued if the land itself is contaminated. Our argument is that intact natural resources are essential elements of many cultural resources, and this aspect requires and demands adequate consideration (and may therefore require compensation).  相似文献   
73.
构建高校学生心理健康教育长效机制的思考   总被引:4,自引:0,他引:4  
大学生心理健康教育是高等学校学生思想政治教育工作的重要组成部分,构建高校学生心理健康教育的长效机制,是此项工作经常、有序、健康、高效开展的重要保证,其核心内容是建立目标体系和运行机制,从而实现该项工作的持续性和实效性目标。  相似文献   
74.
Foot and mouth disease (FMD) is considered by many as the most important animal disease in the world. FMD is highly contagious and outbreaks incur significant costs as affected countries are severely limited in their ability to trade. A number of trade commodities may be contaminated with FMD virus (FMDV) including animal products, for example, meat. As a member of the European Union, Great Britain (GB) has put in place a number of regulations to prevent the importation of pathogens in imported meat products. However, the illegal importation of meat provides a route by which safety controls may be circumvented and meat from FMD affected areas may be imported. This study assesses the FMD infection risk posed to the livestock population of GB from the illegal importation of meat, and estimates the major contributors to this overall risk, through the development of a quantitative risk assessment model. From model results, the total amount of illegal meat entering GB each year is estimated on average to be 11,875 tonnes. with 90% certainty that this is between 4,398 and 28,626 tonnes per year; of which between 64.5 and 565 kg are contaminated with FMDV. This flow of illegal meat results in an estimate of a frequency of FMD infection in GB livestock of 0.015 cases of infected animals per year, with 90% certainty it is between 0.0017 and 0.053. Imports from the region Near and Middle East account for 47% of this risk, and 68% of the risk is attributed to bone-in and dried de-boned products.  相似文献   
75.
民事简易程序亟需加以完善.完善的现实必要性一是"权利的勃兴是一般背景";二是"冲突增多与司法资源有限是客观需求".完善时必须遵守最低程序保障原则、确保基本公正的原则和司法大众化的原则.  相似文献   
76.
十二生肖是一种颇具内涵的文化现象,在我国已有悠久的历史。其特点是以十二种动物配十二地支,以人之生年定所属动物。我国远古的图腾崇拜是十二生肖的滥觞,而干支的创制与中华民族的多元一体则是十二生肖形成的基础.  相似文献   
77.
新形势下高校学生资助与培养教育探析   总被引:1,自引:0,他引:1  
国家资助政策是家庭经济困难学生顺利完成学业的重要保障,是党和国家惠民政策的具体体现,是高校正常开展教育教学活动的基础,是和谐校园建设的重要组成部分:新形势下,高校在开展资助工作的过程中,不是简单的资金发放,而应该是把资助与大学生的培养教育有机结合起来,让学生在受到经济资助、分享党的温暖的同时,懂得如何才能成长为一名社会主义合格的建设者和可靠接班人。  相似文献   
78.
高校后勤社会化改革是一个复杂的系统工程,需经历一个发展的过程.辩证地分析高校后勤现行运行模式的优缺点,探讨社会化改革后高校后勤运行模式选择的基本原则和理性选择的思路,提出高校深化后勤社会化改革的参考模式.  相似文献   
79.
Since children, particularly daughters, are among the most important sources of help and support for older Americans, it has been suggested that women's increasing employment will affect filial relations. Empirical evidence on this issue is inconsistent, in part due to the use of nonprobability samples. Few studies have measured effects for men. We attempt to broaden the scope of this question beyond help to the frail elderly by asking whether employment affects filial relations in general. We examine effects of hours employed on telephone contact, visiting, feelings of closeness, filial attitudes, and assistance to biological parents, for an area probability sample of men and women over 40. There are no effects of employment for men or women on contact, closeness, or assistance. For the vast majority of this population sample, contact and assistance involve few hours per week, and thus do not seem to conflict with employment.  相似文献   
80.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号