全文获取类型
收费全文 | 7138篇 |
免费 | 461篇 |
专业分类
各国政治 | 333篇 |
工人农民 | 224篇 |
世界政治 | 463篇 |
外交国际关系 | 235篇 |
法律 | 5018篇 |
中国政治 | 34篇 |
政治理论 | 1257篇 |
综合类 | 35篇 |
出版年
2020年 | 156篇 |
2019年 | 169篇 |
2018年 | 176篇 |
2017年 | 207篇 |
2016年 | 212篇 |
2015年 | 196篇 |
2014年 | 179篇 |
2013年 | 740篇 |
2012年 | 154篇 |
2011年 | 167篇 |
2010年 | 206篇 |
2009年 | 222篇 |
2008年 | 163篇 |
2007年 | 158篇 |
2006年 | 166篇 |
2005年 | 161篇 |
2004年 | 180篇 |
2003年 | 156篇 |
2002年 | 139篇 |
2001年 | 309篇 |
2000年 | 252篇 |
1999年 | 225篇 |
1998年 | 98篇 |
1997年 | 64篇 |
1996年 | 70篇 |
1995年 | 80篇 |
1994年 | 86篇 |
1993年 | 87篇 |
1992年 | 151篇 |
1991年 | 158篇 |
1990年 | 145篇 |
1989年 | 156篇 |
1988年 | 122篇 |
1987年 | 137篇 |
1986年 | 124篇 |
1985年 | 132篇 |
1984年 | 101篇 |
1983年 | 117篇 |
1982年 | 82篇 |
1981年 | 78篇 |
1980年 | 55篇 |
1979年 | 108篇 |
1978年 | 70篇 |
1977年 | 58篇 |
1976年 | 50篇 |
1975年 | 47篇 |
1974年 | 55篇 |
1973年 | 55篇 |
1972年 | 44篇 |
1968年 | 40篇 |
排序方式: 共有7599条查询结果,搜索用时 15 毫秒
921.
In response to published but unconfirmed reports that health care costs were a leading cause of personal bankruptcy in the U.S., court records of all bankruptcy petitioners in one judicial district were examined. The records were analyzed by income, employment, debt categories and amounts. Within the limitations of the study, health care costs seem not to have played a significant role in the financial lives of this population. 相似文献
922.
Arrow wounds represent an unusual class of wounds rarely seen by most death investigators. Although the edged, broadhead-tipped arrow produces a wound usually characteristic of archery/crossbow weapons, the plain, field-tipped arrow wound can be confused with gunshot injuries in those cases in which powder residue or firearm projectiles or fragments or both are not recovered. We present a case of a deer carcass with a wound of uncertain firearm or archery origin which initiated a comparison of firearm wounds and archery wounds on fresh road-killed deer. We found the following features to be valuable in the differentiation of gunshot wounds and field-tipped archery wounds: First, the majority of the gunshot wounds (but none of the arrow wounds) had identifiable, macroscopic, wipe-off material and chemically identifiable wipe-off residue by spot test. Second, the archery wound defects had very inconspicuous abrasion rings as compared to the often prominent abrasion rings of gunshot wounds. Third, the actual central defect in the archery wounds was more likely to be oblong or slit-like compared to the gunshot wound defects, which were more likely to be round. 相似文献
923.
J A Silva G B Leong R Weinstock C L Boyer 《The Bulletin of the American Academy of Psychiatry and the Law》1989,17(1):5-14
This article discusses Capgras syndrome and its association with harmful and potentially harmful behaviors. Phenomenological and psychodynamic analysis of a series of cases will highlight danger signals that may be present in Capgras patients. 相似文献
924.
925.
A method is described for the determination of glyoxalase I phenotypes in liquid blood and dry bloodstains. The frequencies of glyoxalase I phenotypes in various populations of S.E. England are included. 相似文献
926.
927.
928.
929.
930.