全文获取类型
收费全文 | 19415篇 |
免费 | 818篇 |
专业分类
各国政治 | 772篇 |
工人农民 | 1048篇 |
世界政治 | 1295篇 |
外交国际关系 | 625篇 |
法律 | 12558篇 |
中国共产党 | 1篇 |
中国政治 | 85篇 |
政治理论 | 3771篇 |
综合类 | 78篇 |
出版年
2021年 | 92篇 |
2020年 | 290篇 |
2019年 | 340篇 |
2018年 | 742篇 |
2017年 | 821篇 |
2016年 | 754篇 |
2015年 | 406篇 |
2014年 | 398篇 |
2013年 | 1663篇 |
2012年 | 446篇 |
2011年 | 743篇 |
2010年 | 803篇 |
2009年 | 692篇 |
2008年 | 681篇 |
2007年 | 640篇 |
2006年 | 419篇 |
2005年 | 401篇 |
2004年 | 434篇 |
2003年 | 393篇 |
2002年 | 364篇 |
2001年 | 725篇 |
2000年 | 634篇 |
1999年 | 489篇 |
1998年 | 281篇 |
1997年 | 217篇 |
1996年 | 202篇 |
1995年 | 221篇 |
1994年 | 241篇 |
1993年 | 214篇 |
1992年 | 327篇 |
1991年 | 352篇 |
1990年 | 328篇 |
1989年 | 341篇 |
1988年 | 311篇 |
1987年 | 319篇 |
1986年 | 342篇 |
1985年 | 326篇 |
1984年 | 265篇 |
1983年 | 282篇 |
1982年 | 192篇 |
1981年 | 197篇 |
1980年 | 136篇 |
1979年 | 230篇 |
1978年 | 142篇 |
1977年 | 133篇 |
1976年 | 114篇 |
1975年 | 85篇 |
1974年 | 124篇 |
1973年 | 121篇 |
1972年 | 103篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
211.
212.
213.
214.
Gonzalez Cervera AS 《Estudios demográficos y urbanos》1993,8(2):287-306, 483-4
Data from the 1987 National Health and Fertility Survey were used to explore trends and differentials in unwanted fertility in Mexico. Women were classified in three educational categories: illiterate or incomplete primary, complete primary or some secondary, and complete secondary or more. The four urbanization categories were: under 2500; 2500 to 19,999; 20,000 and more; and metropolitan areas. The place of primary socialization was the place of residence until age 12. Two categories of employment of household head were included, agricultural or nonagricultural. The categories for mother's employment considered employment until the union and employment between the time of union and the birth of the first child. The proportion of births that were unwanted was estimated by calculating the total fertility rate for the year before the survey and comparing it to desired family size. The "total desired family size" was 2.4 for the entire sample. In other words, nearly 37% of the total fertility rate was undesired. The greatest differentials in percentages of undesired fertility were found in educational categories. 40.7% of the total fertility rate in the least educated groups vs. 13.6% in the most educated groups was undesired. Differentials in the other categories ranged from 1.9 for a history of employment before the birth of the first child to 8.8 for agricultural or nonagricultural employment of the household head. When effects of education were controlled, the percentage of undesired fertility declined as educational level increased for all rural or urban residence categories, places of socialization, and employment groups except women who worked before the first child was born. Women with more education, urban residence, and with histories of employment had the lowest levels of undesired fertility. 相似文献
215.
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
216.
With Bill Clinton's new reforms only a month away, the health-care system is on the operating table--and the doctors are under the knife. Americans have a love-hate relationship with physicians: they like the care that doctors provide but hold them to blame for the nation's health-care mess. NEWSWEEK looks at how the culture of medicine may change, assesses doctors' fears--and examines the brave new world of HMOs. 相似文献
217.
218.
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
219.
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
220.
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