全文获取类型
收费全文 | 30765篇 |
免费 | 960篇 |
国内免费 | 5篇 |
专业分类
各国政治 | 1305篇 |
工人农民 | 1241篇 |
世界政治 | 2364篇 |
外交国际关系 | 1084篇 |
法律 | 18839篇 |
中国共产党 | 8篇 |
中国政治 | 215篇 |
政治理论 | 6348篇 |
综合类 | 326篇 |
出版年
2020年 | 408篇 |
2019年 | 479篇 |
2018年 | 602篇 |
2017年 | 719篇 |
2016年 | 740篇 |
2015年 | 529篇 |
2014年 | 586篇 |
2013年 | 2975篇 |
2012年 | 782篇 |
2011年 | 820篇 |
2010年 | 671篇 |
2009年 | 725篇 |
2008年 | 842篇 |
2007年 | 909篇 |
2006年 | 876篇 |
2005年 | 782篇 |
2004年 | 790篇 |
2003年 | 849篇 |
2002年 | 736篇 |
2001年 | 1187篇 |
2000年 | 1052篇 |
1999年 | 884篇 |
1998年 | 504篇 |
1997年 | 387篇 |
1996年 | 377篇 |
1995年 | 348篇 |
1994年 | 424篇 |
1993年 | 390篇 |
1992年 | 589篇 |
1991年 | 650篇 |
1990年 | 596篇 |
1989年 | 570篇 |
1988年 | 588篇 |
1987年 | 558篇 |
1986年 | 597篇 |
1985年 | 557篇 |
1984年 | 470篇 |
1983年 | 501篇 |
1982年 | 402篇 |
1981年 | 389篇 |
1980年 | 286篇 |
1979年 | 394篇 |
1978年 | 277篇 |
1977年 | 235篇 |
1976年 | 205篇 |
1975年 | 229篇 |
1974年 | 255篇 |
1973年 | 209篇 |
1972年 | 200篇 |
1971年 | 175篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
921.
922.
923.
Noelia I. Zanetti DB Andrea Costantino DChem Natalia Lazzarini BSChem Adriana A. Ferrero DB Néstor D. Centeno DB 《Journal of forensic sciences》2021,66(1):245-254
Fluoxetine is a selective serotonin reuptake inhibitor, commonly used for the treatment of a variety of psychopathological conditions. As such, fluoxetine may be expected to appear in clinical and forensic cases. Dermestes maculatus De Geer (Coleoptera: Dermestidae) has been recognized as a relevant component of the insect fauna associated with decomposing human and animal remains. Experiments were conducted to study the effect of fluoxetine on developing D. maculatus using two‐drug administration models: a non‐living animal model (pork muscle) and a living one (Sus scrofa L. pigs). We assessed the duration of immature stages and total life cycle, as well as morphological parameters (body length, cephalic width, and weight). The effect of fluoxetine was studied at an overdose concentration: In the non‐living animal model the drug was mixed with macerated pork muscle (2000 mg/kg) and in the living animal model, pigs were given the drug orally (833 mg/kg). A control was used for each model. Daily observations were performed from the beginning to the end of the experiments. GC‐MS was used for drug detection and quantification. There were no statistically significant differences in the duration of immature stages, life cycle, larval mortality, morphological parameters, or sex ratio, between treatment and control, regardless of the drug administration model. Given that fluoxetine had no detectable effect on the development of D. maculatus, detection of this drug in forensic situations would not compromise the accuracy of PMI estimations. 相似文献
924.
Public Choice - Could North America have been settled more peacefully, with fewer property rights violations against Native Americans? To answer this question, we utilize the case of French... 相似文献
925.
926.
Laura J. McTackett Stuart D. M. Thomas 《Journal of Police and Criminal Psychology》2017,32(2):163-171
Police identification of people experiencing mental illness is usually based on either the person having an official contact history with police or through observing behavioural indicators commonly associated with mental illness during an encounter. Police have voiced concerns with their ability to identify and respond to people experiencing mental illness in a timely way and report that they commonly resort to more coercive tactical options to resolve encounters. The present study employed a mixed method design to examine 286 police use of force incidents to investigate the association between force used on and by offenders displaying irrational-unstable behavioural characteristics. The irrational-unstable offenders were two times more likely to be perceived by police to have an apparent mental disorder and almost four times more likely to have a known mental health history; one in six had an official record of contact with mental health services. There were few differences in police and offender use of force, considering force as both a categorical and a continuous variable, while incident-level comparisons suggested that police force was generally proportional to offender resistance. Implications are discussed in terms of the need to redress limitations with the traditional police approach style. 相似文献
927.
Clifford A.Kiracofe 《北京周报(英文版)》2017,60(38)
<正>Trump’s political inexperience allows the U.S. Establishment to get its way The United States today faces increasing internal political turmoil.As a result,there are both internal and external ramifications.Will the United States provoke war?Will the international community lose confidence in the U.S. leadership? 相似文献
928.
929.
930.