全文获取类型
收费全文 | 5732篇 |
免费 | 119篇 |
专业分类
各国政治 | 237篇 |
工人农民 | 225篇 |
世界政治 | 456篇 |
外交国际关系 | 207篇 |
法律 | 3584篇 |
中国政治 | 49篇 |
政治理论 | 1076篇 |
综合类 | 17篇 |
出版年
2021年 | 40篇 |
2020年 | 69篇 |
2019年 | 103篇 |
2018年 | 131篇 |
2017年 | 115篇 |
2016年 | 118篇 |
2015年 | 68篇 |
2014年 | 118篇 |
2013年 | 583篇 |
2012年 | 140篇 |
2011年 | 152篇 |
2010年 | 122篇 |
2009年 | 138篇 |
2008年 | 167篇 |
2007年 | 155篇 |
2006年 | 140篇 |
2005年 | 129篇 |
2004年 | 155篇 |
2003年 | 124篇 |
2002年 | 100篇 |
2001年 | 310篇 |
2000年 | 277篇 |
1999年 | 193篇 |
1998年 | 80篇 |
1997年 | 79篇 |
1996年 | 52篇 |
1995年 | 54篇 |
1994年 | 48篇 |
1993年 | 38篇 |
1992年 | 121篇 |
1991年 | 139篇 |
1990年 | 131篇 |
1989年 | 126篇 |
1988年 | 113篇 |
1987年 | 125篇 |
1986年 | 100篇 |
1985年 | 95篇 |
1984年 | 96篇 |
1983年 | 83篇 |
1982年 | 57篇 |
1981年 | 73篇 |
1980年 | 34篇 |
1979年 | 73篇 |
1978年 | 43篇 |
1975年 | 37篇 |
1974年 | 49篇 |
1973年 | 54篇 |
1972年 | 39篇 |
1971年 | 34篇 |
1970年 | 29篇 |
排序方式: 共有5851条查询结果,搜索用时 15 毫秒
1.
2.
3.
Ellen K. Marshall Ph.D. 《Journal of Police and Criminal Psychology》2006,21(1):62-71
The present study measured the existence of traumatic stress symptomatology as reported by certified law enforcement officers
within the State of Delaware. A questionnaire was devised which documented age, sex, race, education, years of service, marital
status, children, rank, position, and shift work. The questionnaire was divided into parts which assessed the exposure and
the frequency of specific traumatic incidents experienced in the line of duty, and the frequency of experienced traumatic
symptomatology criteria: re-experiencing, numbing, and arousal. 相似文献
4.
5.
This study aimed to expand the scope of previous research by assessing the effectiveness of soot-removal techniques on glass from petrol-bomb debris using methods of 1% and 2% sodium hydroxide (NaOH) solutions, ultrasonic bath and vacuum suction. Of particular interest were the 1% and 2% NaOH solutions applied to the soot-covered surfaces. Petrol bombs containing petrol or a 50:50 mix of petrol and motor oil were exploded and the debris was collected for analysis. Favourable results were found to varying degrees using each of the soot-removal methods with the 1% and 2% NaOH wash solutions, being the most useful. The 2% NaOH solution also proved successful as a soak to loosen and remove heavy contamination of soot and accelerants without damaging the finger mark beneath. This study also found that recovery of finger marks in blood from beneath soot using the 2% NaOH solution was possible. Finger marks were also applied to glass bottles with plastic adhesive labels, and providing the fire damage is not too great marks were also retrievable. Results from this study lead to the conclusion that the NaOH wash solution is ideally suited for soot removal to reveal latent and blood-contaminated marks both within the laboratory and at crime scenes. 相似文献
6.
7.
8.
K A Hewadikaram M L Goff 《The American journal of forensic medicine and pathology》1991,12(3):235-240
Decomposition studies were conducted using two carcasses of domestic pigs, Sus scrofa L., 8.4 kg and 15.1 kg in weight, to determine the effects of carcass size on the rate of decomposition, composition of the arthropod fauna, and succession patterns. A total of 46 arthropod taxa were recovered during this study. No size-related differences were observed between carcasses with respect to composition of the arthropod fauna or patterns of succession. A greater number of arthropods were observed attracted to the 15.1-kg carcass, and the rate of decomposition observed was more rapid for the 15.1-kg carcass than for the 8.4-kg carcass. Internal temperatures of the 8.4-kg carcass were more directly related to external ambient temperatures during the fresh and bloated stages of decomposition. During the decay stage, both carcasses generated internal temperatures significantly above ambient temperatures. Following this stage, internal temperatures fell to approximate ambient temperatures during the postdecay and remains stages. 相似文献
9.
James K. Galbraith 《Journal of policy analysis and management》1991,10(1):134-135
10.
Laura K. Landolt 《Global Society》2007,21(3):393-414
To demonstrate that norms have independent causal power, constructivists de-emphasise material factors related to state interests and highlight social factors. Similarly, they conceptualise international organisations as autonomous from state influence, and focus on cases featuring non-state actors that stimulate a “tipping point” of norm diffusion among states in advance of state sponsorship. By contrast, this article utilises an historical materialist approach that admits both social and material data to examine the contrasting case of population control. It finds that US corporate foundations, eugenist demographers, feminist birth control activists and related NGOs conceptualised and promoted population control in the United States, at the United Nations, and across developing countries. However, the tipping point of norm diffusion occurred only after the United States publicly advocated population control. Indeed, material and social factors were inextricably bound together. 相似文献