全文获取类型
收费全文 | 13480篇 |
免费 | 398篇 |
专业分类
各国政治 | 597篇 |
工人农民 | 646篇 |
世界政治 | 733篇 |
外交国际关系 | 405篇 |
法律 | 8857篇 |
中国共产党 | 3篇 |
中国政治 | 98篇 |
政治理论 | 2446篇 |
综合类 | 93篇 |
出版年
2020年 | 155篇 |
2019年 | 191篇 |
2018年 | 344篇 |
2017年 | 321篇 |
2016年 | 375篇 |
2015年 | 231篇 |
2014年 | 229篇 |
2013年 | 1241篇 |
2012年 | 426篇 |
2011年 | 400篇 |
2010年 | 269篇 |
2009年 | 306篇 |
2008年 | 360篇 |
2007年 | 305篇 |
2006年 | 365篇 |
2005年 | 660篇 |
2004年 | 403篇 |
2003年 | 301篇 |
2002年 | 306篇 |
2001年 | 438篇 |
2000年 | 381篇 |
1999年 | 291篇 |
1998年 | 154篇 |
1997年 | 164篇 |
1996年 | 144篇 |
1995年 | 147篇 |
1994年 | 137篇 |
1993年 | 162篇 |
1992年 | 272篇 |
1991年 | 294篇 |
1990年 | 268篇 |
1989年 | 272篇 |
1988年 | 259篇 |
1987年 | 267篇 |
1986年 | 290篇 |
1985年 | 282篇 |
1984年 | 248篇 |
1983年 | 248篇 |
1982年 | 133篇 |
1981年 | 124篇 |
1980年 | 100篇 |
1979年 | 146篇 |
1978年 | 114篇 |
1977年 | 99篇 |
1975年 | 98篇 |
1974年 | 120篇 |
1973年 | 106篇 |
1972年 | 97篇 |
1970年 | 85篇 |
1968年 | 88篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
Correlation between plasma and bone marrow tricyclic antidepressants has not been studied before. Two groups of rabbits were given 10 and 20 mg of desipramine/kg body weight, respectively. Desipramine was administered to the animals once daily by mouth for 5 days. On the fifth day the animals were sacrificed and blood and bone marrow samples were collected and analyzed using a high performance liquid chromatographic (HPLC) method. Data showed that a correlation exists between bone marrow and blood desipramine. The bone marrow desipramine concentration increased as its blood levels increased. The average ratio of bone marrow to blood desipramine +/- S.D. (standard deviation) in both dosage groups was 37.2 +/- 4.46 with a range of 30.99-44.82. This investigation is promising and shows that bone marrow could be used as an alternative tissue in the absence of a suitable blood sample. 相似文献
52.
The formation of adequate mental health systems within prisons has accelerated as a result of successful class action lawsuits. Our recent national survey questioned all state correctional departments about the existence of standards in each system, compliance with such standards, prevalence of class action lawsuits involving the issue of providing adequate mental health services for inmates, issues related to consent decrees, available mental health resources within the correctional system, and the administrative structure of the mental health system. Our purpose was to identify those factors correlated with certified class action lawsuits involving issues related to mental health services. Twenty-one states were involved in such litigation. Only the presence of psychiatric hospitals operated by the department of corrections correlated with the presence of certified class action lawsuits involving mental health services. Prison systems larger than 15,000 inmates were at higher risk for such litigation. Smaller systems having psychiatric hospitals run by the state mental health agency appeared to be at less risk for such litigation. 相似文献
53.
54.
Comparison of a suspected biter's dental arches with the patterned injury of a bite mark is especially difficult when the bite occurs in an anatomic location with a small radius of curvature or with complex or compound curves. The authors present two case reports in which human skin was used as a template for the reproduction of a bite. In one case the victim's skin was used; in the other, the skin of a anatomically similar person was used. The use of inked dental casts, photography, and transparent overlays significantly reduced the errors common to analysis of bite marks in these highly curved areas. 相似文献
55.
56.
57.
In the statistical interpretation of forensic glass evidence it is standard practice to make the assumption of homogeneity of the refractive index (RI) of the source glass, or of localized homogeneity. However, the work of Locke and Hayes showed that, for toughened windscreen glass, this assumption might not be true. This work is well cited, but there appears to have been little follow-on published research. Furthermore, the toughening process is something known to affect the refractive index, and is a process that float glass does not undergo. Float glass is a major component of casework in New Zealand and for that reason it would be interesting to know whether the findings of Locke and Hayes apply when dealing with float glass. In this paper we describe an experiment similar to that of Locke and Hayes, systematically examining the variation of RI in a pane of float window glass. It was found that, although there were no systematic differences in refractive index, there were observable differences across the pane. 相似文献
58.
Report of an unusual finding of bones on the shore of the Baltic Sea. Although the morphological findings appeared similar to a human foot skeleton, a quick identification as sea dog bone was possible. 相似文献
59.
60.
We report a case of rapid death from thrombotic thrombocytopaenic purpura (TTP) in a young pregnant lady who developed full blown symptoms soon after caesarean section. Extensive intramyocardial confluent haemorrhages and widespread microthrombi in heart, brain, adrenals and kidney were found at autopsy. Thrombotic thrombocytopaenic purpura is an uncommon condition, which carries a high fatality rate if untreated. Awareness of this syndrome together with its high risk of sudden death underlines the importance of rapid diagnosis and treatment. 相似文献