全文获取类型
| 收费全文 | 16248篇 |
| 免费 | 175篇 |
| 国内免费 | 26篇 |
专业分类
| 教育 | 10662篇 |
| 科学研究 | 2463篇 |
| 各国文化 | 156篇 |
| 体育 | 1504篇 |
| 综合类 | 7篇 |
| 文化理论 | 133篇 |
| 信息传播 | 1524篇 |
出版年
| 2021年 | 171篇 |
| 2020年 | 243篇 |
| 2019年 | 384篇 |
| 2018年 | 489篇 |
| 2017年 | 480篇 |
| 2016年 | 406篇 |
| 2015年 | 273篇 |
| 2014年 | 369篇 |
| 2013年 | 2990篇 |
| 2012年 | 407篇 |
| 2011年 | 366篇 |
| 2010年 | 331篇 |
| 2009年 | 315篇 |
| 2008年 | 336篇 |
| 2007年 | 338篇 |
| 2006年 | 303篇 |
| 2005年 | 291篇 |
| 2004年 | 259篇 |
| 2003年 | 236篇 |
| 2002年 | 237篇 |
| 2001年 | 246篇 |
| 2000年 | 254篇 |
| 1999年 | 234篇 |
| 1998年 | 144篇 |
| 1997年 | 146篇 |
| 1996年 | 176篇 |
| 1995年 | 129篇 |
| 1994年 | 152篇 |
| 1993年 | 132篇 |
| 1992年 | 190篇 |
| 1991年 | 184篇 |
| 1990年 | 199篇 |
| 1989年 | 203篇 |
| 1988年 | 152篇 |
| 1987年 | 141篇 |
| 1986年 | 192篇 |
| 1985年 | 177篇 |
| 1984年 | 157篇 |
| 1983年 | 147篇 |
| 1982年 | 138篇 |
| 1981年 | 126篇 |
| 1980年 | 133篇 |
| 1979年 | 163篇 |
| 1978年 | 142篇 |
| 1977年 | 120篇 |
| 1976年 | 112篇 |
| 1975年 | 93篇 |
| 1974年 | 113篇 |
| 1973年 | 93篇 |
| 1971年 | 101篇 |
排序方式： 共有10000条查询结果，搜索用时 15 毫秒
41.
42.
44.
45.
46.
1 Introduction New technologies and other developments haye changedthe information seeking behaviors of the academic communityand the general public.Nowhere is this more evident than inthe exponential growth of the World Wide Web and cellularphone usage.Responding to these user needs and newtechnologies,libraries are moving from being InformationWarehouses to becoming Information Portals.Full-text 相似文献
47.
48.
V H Holtz 《Journal of the Medical Library Association》1986,74(4):305-314
Questions concerning some of the values we hold as librarians and the goals, standards, and other evaluation tools we derive from them are discussed in the context of the history of our profession and the present period of rapid change. The concepts of stable and changing paradigms and of "scientific communities" provide the foundation for consideration of how a changing conceptual framework can affect values and their application in the evaluation process. One of many possible scenarios for the future is briefly outlined to demonstrate how some traditional values may fare. 相似文献
49.
50.
This article reports the results of a survey of literature on measures of library effectiveness. This survey led to the formulation of six criterion concepts (accessibility, cost, user satisfaction, response time, cost/benefit ratio, and use). The advantages and disadvantages of each method of measurement are discussed. Several points which became clear during the analysis are discussed. First, there is a relative lack of concern with the rationale behind the evaluation process, although the results invariably lead to a confused interpretation when there is no clear understanding of the purpose of an evaluation. Second, the total library system is rarely considered; instead, each evaluation criterion is taken in isolation rather than as part of the whole. Third, the library's preservation function has not been considered at all. 相似文献