全文获取类型
收费全文 | 16747篇 |
免费 | 263篇 |
专业分类
各国政治 | 802篇 |
工人农民 | 534篇 |
世界政治 | 1433篇 |
外交国际关系 | 909篇 |
法律 | 9489篇 |
中国共产党 | 1篇 |
中国政治 | 102篇 |
政治理论 | 3640篇 |
综合类 | 100篇 |
出版年
2023年 | 85篇 |
2021年 | 109篇 |
2020年 | 297篇 |
2019年 | 361篇 |
2018年 | 425篇 |
2017年 | 486篇 |
2016年 | 565篇 |
2015年 | 410篇 |
2014年 | 438篇 |
2013年 | 1853篇 |
2012年 | 422篇 |
2011年 | 486篇 |
2010年 | 439篇 |
2009年 | 458篇 |
2008年 | 496篇 |
2007年 | 507篇 |
2006年 | 488篇 |
2005年 | 439篇 |
2004年 | 446篇 |
2003年 | 406篇 |
2002年 | 411篇 |
2001年 | 581篇 |
2000年 | 528篇 |
1999年 | 403篇 |
1998年 | 276篇 |
1997年 | 239篇 |
1996年 | 206篇 |
1995年 | 187篇 |
1994年 | 220篇 |
1993年 | 212篇 |
1992年 | 263篇 |
1991年 | 282篇 |
1990年 | 266篇 |
1989年 | 269篇 |
1988年 | 268篇 |
1987年 | 232篇 |
1986年 | 280篇 |
1985年 | 248篇 |
1984年 | 196篇 |
1983年 | 200篇 |
1982年 | 139篇 |
1981年 | 155篇 |
1980年 | 105篇 |
1979年 | 151篇 |
1978年 | 98篇 |
1977年 | 89篇 |
1976年 | 87篇 |
1974年 | 107篇 |
1973年 | 77篇 |
1972年 | 74篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Family courts and child welfare agencies across the country are charged with protecting the safety of our children. That mission has become more challenging with increasing federal legislation and decreasing funding. In Buffalo, N.Y., the Family Court and the Department of Social Services have teamed up to respond to this challenge. With minimal additional staffing and resources, they have led a collaboration of agencies and service providers to change the way business is done in child welfare. By engaging each other in an interagency system change effort, the amount of time children spend in foster care has been reduced. The collaboration has been able to accomplish in a relatively short time what no agency had previously been able to accomplish on its own. The beneficiaries have been the children and families of Erie County. 相似文献
22.
In the wake of the 1990 amendments to the Clean Air Act, localities across the United States initiated public information campaigns both to raise awareness of threats to air quality and to change behavior related to air pollution by recommending specific behavioral changes in the campaign messages. These campaigns are designed to reduce the health hazards associated with poor air quality and to avoid federal sanctions resulting from the failure to meet air quality standards. As in many other communities across the country, a coalition of government agencies and businesses initiated a public information campaign in the Atlanta metropolitan region to reduce certain targeted behaviors, mainly driving. A two‐stage model used to analyze data from a rolling sample survey shows that the centerpiece of the information campaign—air quality alerts—was effective in raising awareness and reducing driving in a segment of the population. When the overall information campaign was moderated by employers' participation in programs to improve air quality, drivers significantly reduced the number of miles they drove and the number of trips they took by car on days when air quality alerts were sounded. Public information campaigns can be successful in increasing awareness, but changing well‐established behaviors, such as driving, is likely to require institutional mediation to provide social contexts that support the behavioral change, as well. © 2003 by the Association for Public Policy Analysis and Management. 相似文献
23.
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
24.
C Moore S Browne I Tebbett A Negrusz W Meyer L Jain 《Forensic science international》1992,56(2):177-181
A new solid-phase extraction procedure for the determination of cocaine and benzoylecgonine in amniotic fluid, using high flow co-polymeric sorbents is reported. The recoveries of cocaine and benzoylecgonine within the range 0.1-1 mg/l were 95.7% and 50.3%, respectively. The use of high-flow sorbents allowed the easy extraction of amniotic fluid regardless of sample viscosity or physical nature. The use of these solid-phase columns provided many advantages over the more commonly used solvent extraction, including an increase in extraction speed and efficiency, reduced operator time, reduced solvent use and disposal volumes and exceptional extract quality. Further, the determination of amniotic fluid obtained from pregnant cocaine users may provide important information about handling of cocaine by the fetus at various gestational ages. The procedure was successfully applied to amniotic fluid from suspected cocaine abusers. 相似文献
25.
26.
Presented in this paper are the initial results involving the use of the nose or outer ear as temperature measurement sites to determine the postmortem period of the human corpse. Simple mathematical models for both sites are developed based on cooling curves of five corpses. Analysis of errors between actual and calculated postmortem intervals suggest that in its present form, the described methods would not be suitable for use in accurately determining the time since death of human corpses. 相似文献
27.
28.
29.
A dissecting intramural haematoma of the coronary artery is an infrequent cause of sudden and unexpected death. Most cases are women and in a significant number of these women, the haematoma occurred at term to 80 days postpartum. Because the intimal rupture and communication with the lumen were not found in most of the cases, the site of rupture has been considered to be a vasa vasorum. The authors report on a case of one woman who was at a later postpartum period (106 days). The microscopic finding of the dissected coronary artery revealed two intimal tears in a section. The case showed that the dissecting intramural haematoma of the coronary artery is caused not only by the rupture of the vasa vasorum but also by the rupture of the intima. 相似文献
30.
Michael Levine 《Crime, Law and Social Change》1993,20(1):1-12
“I Volunteer to Kidnap Ollie North”, is an exercise in following our government's sometimes criminal, often bizarre and always hypocritical actions in the war on drugs during the Reagan-Bush years to their logical conclusion. The Supreme Court has indicated in its June, 1992 decision in U.S. v Machain, that American law enforcement officers can now enter the sovereign territories of other nations to legally abduct violators of U.S. drug laws. Iran immediately proclaimed that they had the same right for violations of Islamic law. What might happen if kidnapping becomes a recognized “tool” of international law enforcement? What prominent Americans might wake up in South American jails with bags over their heads? 相似文献