全文获取类型
收费全文 | 14550篇 |
免费 | 211篇 |
专业分类
各国政治 | 515篇 |
工人农民 | 1289篇 |
世界政治 | 593篇 |
外交国际关系 | 522篇 |
法律 | 8845篇 |
中国政治 | 48篇 |
政治理论 | 2913篇 |
综合类 | 36篇 |
出版年
2023年 | 47篇 |
2020年 | 101篇 |
2019年 | 118篇 |
2018年 | 1403篇 |
2017年 | 1344篇 |
2016年 | 1170篇 |
2015年 | 162篇 |
2014年 | 147篇 |
2013年 | 662篇 |
2012年 | 345篇 |
2011年 | 1073篇 |
2010年 | 1115篇 |
2009年 | 718篇 |
2008年 | 873篇 |
2007年 | 835篇 |
2006年 | 177篇 |
2005年 | 192篇 |
2004年 | 323篇 |
2003年 | 297篇 |
2002年 | 153篇 |
2001年 | 269篇 |
2000年 | 259篇 |
1999年 | 191篇 |
1998年 | 89篇 |
1997年 | 86篇 |
1996年 | 94篇 |
1995年 | 94篇 |
1994年 | 95篇 |
1993年 | 67篇 |
1992年 | 147篇 |
1991年 | 136篇 |
1990年 | 164篇 |
1989年 | 155篇 |
1988年 | 164篇 |
1987年 | 146篇 |
1986年 | 133篇 |
1985年 | 132篇 |
1984年 | 107篇 |
1983年 | 96篇 |
1982年 | 70篇 |
1981年 | 63篇 |
1980年 | 52篇 |
1979年 | 71篇 |
1978年 | 59篇 |
1977年 | 48篇 |
1975年 | 39篇 |
1974年 | 49篇 |
1973年 | 37篇 |
1971年 | 39篇 |
1970年 | 44篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
941.
942.
943.
944.
An investigation of the following psychoactive drugs: barbiturate, benzodiazepine, meprobamate, methaqualone and phenothiazine, was performed on all automobile occupants killed in accidents in southern Sweden during 1977 and 1978. Of 122 drivers and 55 passengers analysed, low concentrations of these drugs were found in nine drivers and in five passengers. Thus, 7.3% of the drivers were driving under the influence of drugs and, of these, two drivers (1.6% of all analysed drivers) were also inebriated. Twenty-three per cent of the drivers were inebriated only. According to the circumstances in the accidents and the number of drivers whose analyses proved positive, drug influence seldom seems to be the cause of fatal traffic accidents. 相似文献
945.
This report describes a case of fatal retropleural hematoma complicating percutaneous insertion of a central vein catheter. The patient was a 55-year-old female undergoing surgery for severe rheumatic mitral valve disease. Factors responsible for this catastrophic incident are the anticoagulation of the patient, the edematous state of the soft tissues, and the multiple punctures of the wall of the jugular vein. 相似文献
946.
In recent times, juvenile rehabilitation has been attacked both by liberals seeking to insert greater due process rights and protections into the juvenile justice system and by conservatives calling for more stringent handling of serious youthful offenders. The apparent pervasiveness of this attack raises the question, Is the philosophy of child saving dead? Data drawn from a survey conducted in Illinois suggest, however, that juvenile rehabilitation continues to receive support both from the public and from various groups associated with criminal justice practice and policy making. At the same time, there is also support for the notion that young criminals are responsible for their actions and are currently being treated too leniently by our courts. Finally, child saving is embraced most firmly by judges, lawyers, correctional administrators, and prison inmates and least strongly by legislators, prison guards, and the general public. 相似文献
947.
948.
S T Folland 《Journal of health politics, policy and law》1985,10(2):329-345
This paper begins by assessing the current status of health care advertising and its potential for growth, arguing that this form of marketing is not just a passing fad among a few clinics and hospitals. It then describes the opposing schools of thought concerning the economics of advertising, and considers both theory and evidence on the effects of advertising on prices, profits, quality, utilization, and innovation. 相似文献
949.
950.