全文获取类型
收费全文 | 17380篇 |
免费 | 459篇 |
专业分类
各国政治 | 734篇 |
工人农民 | 660篇 |
世界政治 | 1447篇 |
外交国际关系 | 582篇 |
法律 | 10410篇 |
中国共产党 | 2篇 |
中国政治 | 85篇 |
政治理论 | 3746篇 |
综合类 | 173篇 |
出版年
2020年 | 209篇 |
2019年 | 248篇 |
2018年 | 321篇 |
2017年 | 388篇 |
2016年 | 412篇 |
2015年 | 291篇 |
2014年 | 342篇 |
2013年 | 1661篇 |
2012年 | 421篇 |
2011年 | 439篇 |
2010年 | 354篇 |
2009年 | 389篇 |
2008年 | 449篇 |
2007年 | 468篇 |
2006年 | 449篇 |
2005年 | 404篇 |
2004年 | 396篇 |
2003年 | 426篇 |
2002年 | 382篇 |
2001年 | 680篇 |
2000年 | 619篇 |
1999年 | 512篇 |
1998年 | 291篇 |
1997年 | 250篇 |
1996年 | 211篇 |
1995年 | 209篇 |
1994年 | 253篇 |
1993年 | 229篇 |
1992年 | 346篇 |
1991年 | 372篇 |
1990年 | 339篇 |
1989年 | 353篇 |
1988年 | 322篇 |
1987年 | 339篇 |
1986年 | 345篇 |
1985年 | 337篇 |
1984年 | 287篇 |
1983年 | 323篇 |
1982年 | 265篇 |
1981年 | 242篇 |
1980年 | 184篇 |
1979年 | 252篇 |
1978年 | 171篇 |
1977年 | 145篇 |
1976年 | 136篇 |
1975年 | 125篇 |
1974年 | 136篇 |
1973年 | 121篇 |
1972年 | 117篇 |
1971年 | 94篇 |
排序方式: 共有10000条查询结果,搜索用时 9 毫秒
51.
D.S.T Lo T.C Chao S.E Ng-Ong Y.J Yao T.H Koh 《Forensic Science International Supplement Series》1997,90(3):626
Blood previously acidified with aqueous saturated ammonium chloride solution was extracted with ethyl acetate. The dried extract was subjected to acetonitrile–hexane partition. The acetonitrile portion was analysed for the presence of acidic and neutral drugs by HPLC–DAD (200 mm×2.1 mm I.D. microbore ODS-Hypersil column) and GC–FID (25 m narrow-bore×0.25 mm I.D. HP-5 column with 0.33 μm film thickness). The protocol was found to be suitable for both clinical toxicology (including emergency toxicology) and postmortem toxicology. At least 66 drugs of interest were unequivocally identified by RRTs (HPLC) and UV spectra (DAD) match while another 12 were unequivocally identified by double RRTs match (HPLC and GC). Quantitation was facilitated by incorporating calibration blood standards in each assay batch. The five drugs most commonly encountered in clinical blood specimens (1150 cases) were: paracetamol (47.4% of the cases); chlormezanone (6.6%), theophylline (1.74%), naproxen (1.65%) and mefenamic acid (1.56%). The following drugs were detected in toxicologically significant quantities in postmortem blood specimens (245 cases): phenobarbitone (1.22% of the cases), naproxen (0.82%), chlormezanone (0.82%), theophylline (0.82%), carbamazepine (0.41%) and paracetamol (0.41%). 相似文献
52.
ROBERT AGNEW 《犯罪学》1990,28(4):535-566
The dominant theories of delinquency tend to view the delinquent as a deprived individual who engages in delinquency because of forces beyond his or her control. This paper challenges that image, awing that many adolescents possess resources that increase their power and autonomy. This power and autonomy may be used to reduce social control and increase “Illegitimate means,” which in turn increase the likelihood of delinquency. Whether adolescents use their resources for delinquent ends is conditioned by several factors, most notably the adolescent's predisposition for delinquency, the benefits and costs of employing resources for delinquent ends in a particular situation, and the adolescent's perceived self-efficacy. Data from two nationally representative surveys of adolescents are used to analyze the relation between resources and delinquency among adolescents differing in their predisposition for delinquency. In most cases, resources are positively related to delinquency when the predisposition for delinquency is high. 相似文献
53.
54.
55.
The extent to which local life circumstances influence criminal activity has been the focus of much theoretical debate. Although empirical research has been initiated, it remains limited. Herein, we use data on 524 serious offenders from the California Youth Authority for a seven‐year post‐parole period to examine the relationship between changes in local life circumstances and criminal activity. We extend previous research by employing a statistical model that accounts for the joint distribution of violent and nonviolent crime during the late teens and twenties in order to present information on patterns of criminal activity during a newly recognized developmental period of the life course, “emerging adulthood.” 相似文献
56.
D J WILLIAMS WILLIAM B. STREAN ENRIQUE GARCIA BENGOECHEA 《Juvenile & family court journal》2002,53(2):31-41
This article discusses relevant literature on the potential benefits of sport, recreation, and leisure, and how these benefits relate to rehabilitation of juveniles. Many professionals involved in juvenile rehabilitation believe sport and recreation are beneficial adjuncts to treatment programming; however, it can be difficult to structure sport and recreation in ways that directly correspond to treatment goals. The purpose of this article is to provide insights for professionals working with juveniles on how sport and recreation programming can be an effective means of helping to achieve rehabilitation goals. Attention is given to approaches, particularly the Teaching Games for Understanding model (Bunker & Thorpe, 1982), which can be used to effectively link recreation and sport to the rehabilitation process. 相似文献
57.
58.
59.
60.
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