全文获取类型
收费全文 | 12710篇 |
免费 | 645篇 |
专业分类
各国政治 | 784篇 |
工人农民 | 366篇 |
世界政治 | 1076篇 |
外交国际关系 | 590篇 |
法律 | 7292篇 |
中国政治 | 68篇 |
政治理论 | 3071篇 |
综合类 | 108篇 |
出版年
2023年 | 57篇 |
2020年 | 223篇 |
2019年 | 260篇 |
2018年 | 303篇 |
2017年 | 345篇 |
2016年 | 366篇 |
2015年 | 301篇 |
2014年 | 322篇 |
2013年 | 1646篇 |
2012年 | 296篇 |
2011年 | 334篇 |
2010年 | 337篇 |
2009年 | 355篇 |
2008年 | 347篇 |
2007年 | 405篇 |
2006年 | 343篇 |
2005年 | 329篇 |
2004年 | 367篇 |
2003年 | 343篇 |
2002年 | 311篇 |
2001年 | 413篇 |
2000年 | 357篇 |
1999年 | 315篇 |
1998年 | 219篇 |
1997年 | 162篇 |
1996年 | 172篇 |
1995年 | 156篇 |
1994年 | 156篇 |
1993年 | 171篇 |
1992年 | 223篇 |
1991年 | 243篇 |
1990年 | 221篇 |
1989年 | 223篇 |
1988年 | 195篇 |
1987年 | 218篇 |
1986年 | 206篇 |
1985年 | 182篇 |
1984年 | 170篇 |
1983年 | 182篇 |
1982年 | 146篇 |
1981年 | 127篇 |
1980年 | 99篇 |
1979年 | 150篇 |
1978年 | 111篇 |
1977年 | 102篇 |
1976年 | 74篇 |
1975年 | 72篇 |
1974年 | 81篇 |
1973年 | 89篇 |
1972年 | 65篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
151.
152.
The “tragedy of the commons” is the familiar problem that open access to a common property resource leads to overexploitation and to zero profits. A commons model is applied to an example of state sponsored private violence, the practice of privateering or licensed piracy. It is predicted that the presence of uncertainty about the value of the prey will reduce the amount of exploitation effort, and that industry profits may be positive due to both uncertainty and heterogeneous exploiters. Using data from England's wars with France and Spain between 1625 and 1630, the model suggests that the commons, represented by enemy merchant shipping, was not overexploited and that privateering profits were positive. The dynamic paths of privateering effort, ships seized, and individual firm profits were, however, consistent with the normal expectation that commons exploitation will peak and fall, as competition drives down returns through entry. “England was never richer than when at war with Spain.” Sir Edward Coke 相似文献
153.
Public preferences about the availability of abortion under various circumstances have remained fairly stable over time. Yet a standard CBS/New York Times abortion question indicates that a significant shift in opinion occurred during the 1980s, whereby the public became increasingly supportive of legalized abortion as it is now. These very different patterns of public opinion about abortion suggest that the public perceived a shift in the abortion status quo, toward more restricted access, over time, and became more supportive of current abortion policy.A model of support for legalized abortion as it is now is developed that incorporates the influences of court activities and interest-group behavior. The analysis indicates that the public reacted directly to the activities of the courts, becoming more supportive of current abortion policy in response to media coverage of court cases that challenged the abortion status quo and Supreme Court nominations and confirmations. Although absolute preferences remained largely unchanged, it appears the public perceived an increasing threat to the status quo and became correspondingly less enamored with further restrictions on the availability of abortion. 相似文献
154.
155.
Measuring School-Related Stressors in Adolescents 总被引:2,自引:0,他引:2
Some 1620 high school students responded to 68 items that measure adolescent stressors. Thirty-five of the items were based on J. P. Kohn and G. H. Frazer's Academic Stress Scale [1(1986) An Academic Stress Scale: Identification and Rated Importance of Academic Stressors, Psychological Reports, Vol. 59, pp. 415–426] developed in the United States, while the remaining 33 items were developed from P. Strutynski's [(1985) A Survey of Queensland Year 10, 11 and 12 Student Attitudes to Schools and Schooling, State Planning Committee, International Youth Year, Brisbane] lists of the most frequently named problems of 2336 Australian high school students. Confirmatory Factor Analysis was used to test and develop a measurement model developed from an extensive review of previous scales. The High School Stressors Scale emerged from the analytic process and measures nine school-related stressors. For researchers focusing on school-related problems and stressors among adolescents, the HSSS promises to be a very useful instrument. It has sound construct and predictive validity and adequate reliability, as demonstrated by the goodness-of-fit indices the squared multiple correlations. 相似文献
156.
The author relates three cases of conflict which he has observed in Cairo and recognizes patterns that cut across each of these stories. The stories shed light on how people in Egypt approach and deal with conflict; in addition, they may help readers understand conflict in their home culture as well as be instructive on how to listen to conflict in different cultures. Six general themes in the way Egyptians approach or handle conflict are identified, and each of these themes is analyzed. 相似文献
157.
Negotiating on-line is becoming an increasingly common phenomenon in the workplace. The medium of the Internet also offers promising, opportunities for negotiation educators to reach out to participants that might otherwise be unable to attend a seminar. The authors used the Internet to teach negotiation theory and skills during a seven-week seminar that was conducted completely over the World Wide Web. This experiment revealed several advantages and difficulties likely to arise in the conduct of distance learning for topics in negotiation. The authors reflect on how they would organize the seminar differently, should they do it again, and offer suggestions for others organizing courses using the Internet. 相似文献
158.
Gin BR 《Columbia law review》1997,97(5):1406-1434
This Note discusses the potential for genetic discrimination, current views as to whether genetic conditions will be covered by the Americans with Disabilities Act ("ADA"), and the specific issue of whether presymptomatic persons who test positive for Huntington's disease should be classified as persons with a "disability" within the meaning of the ADA. In considering whether presymptomatic Huntington's individuals have a disability under the ADA, an analogy is made between Huntington's disease and HIV-positive status. Inter alia, Huntington's disease and HIV-positive status are analogous in that, at the time of diagnosis, victims of both diseases may have no symptoms and may remain healthy for a number of years; but even though the exact time of onset of both diseases is unascertainable, death of both victims within a given range of years is highly likely. Further, both Huntington's disease and HIV are transmitted to offspring at a relatively high rate. Given these similarities, the author argues that Huntington's individuals should be afforded the protections of the ADA for the same reasons that HIV-positive persons are protected. 相似文献
159.
160.