全文获取类型
收费全文 | 14356篇 |
免费 | 732篇 |
专业分类
各国政治 | 680篇 |
工人农民 | 471篇 |
世界政治 | 1174篇 |
外交国际关系 | 575篇 |
法律 | 8765篇 |
中国共产党 | 3篇 |
中国政治 | 109篇 |
政治理论 | 3226篇 |
综合类 | 85篇 |
出版年
2023年 | 187篇 |
2021年 | 123篇 |
2020年 | 239篇 |
2019年 | 307篇 |
2018年 | 342篇 |
2017年 | 418篇 |
2016年 | 414篇 |
2015年 | 317篇 |
2014年 | 367篇 |
2013年 | 1638篇 |
2012年 | 324篇 |
2011年 | 415篇 |
2010年 | 391篇 |
2009年 | 416篇 |
2008年 | 393篇 |
2007年 | 355篇 |
2006年 | 387篇 |
2005年 | 369篇 |
2004年 | 355篇 |
2003年 | 325篇 |
2002年 | 351篇 |
2001年 | 538篇 |
2000年 | 497篇 |
1999年 | 359篇 |
1998年 | 242篇 |
1997年 | 209篇 |
1996年 | 162篇 |
1995年 | 170篇 |
1994年 | 201篇 |
1993年 | 182篇 |
1992年 | 233篇 |
1991年 | 277篇 |
1990年 | 242篇 |
1989年 | 266篇 |
1988年 | 234篇 |
1987年 | 223篇 |
1986年 | 269篇 |
1985年 | 247篇 |
1984年 | 193篇 |
1983年 | 210篇 |
1982年 | 152篇 |
1981年 | 169篇 |
1980年 | 120篇 |
1979年 | 171篇 |
1978年 | 107篇 |
1977年 | 91篇 |
1976年 | 100篇 |
1974年 | 92篇 |
1973年 | 89篇 |
1972年 | 78篇 |
排序方式: 共有10000条查询结果,搜索用时 17 毫秒
41.
The remains of an unidentified female neonate were discovered in a field in central Missouri. Examination revealed bilateral absence of the parietal bones. A search of the literature describing similar defects suggests that the present case represents a unique condition, described here for the first time. 相似文献
42.
Harold James Author Vitae 《Orbis》2007,51(3):397-412
The most ferocious debates are about whether the United States should be described as imperial, but in practice other countries also try to influence other countries’ domestic policies, to propagate their visions, to exert power and to stabilize areas beyond their borders that are perceived as a source of threats. While in the 1990s the winners of globalization were seen as small open states, since the turn of the millennium big powers appear to be gaining because of their ability to project political power: the United States, but also China, Russia, India, and Brazil. This makes for a greater instability and leads to the formulation of theories of realism or neo-realism. The essay concludes with an examination of alternatives to empire and the neo-imperial vision, in particular the importance of elaboration of common or shared values in helping to build a safer and more peaceful international order. 相似文献
43.
We use data from 1983 and 1985 on the volume of Medicare physician services to analyze whether Medicare's Prospective Payment System (PPS), which resulted in a significant decline in hospital spending, led to a partially offsetting increase in real expenditures for physician services. We also analyze the effect of increases in assignment rates, increasing incomes of the elderly, and other factors on real expenditures during this period. Our main conclusion is that PPS has at most a small positive effect on real physician expenditures. Because people spent less time in the hospital, Medicare physician spending declined; but because of incentives to shift radiology and other services out of the hospital, some of this decline was offset. We also conclude that the sharp increase in Medicare assignment rates over this period, along with the rising incomes of the elderly during this period, contributed to the observed growth. 相似文献
44.
Reintegration was prioritised over demobilisation and disarmament in Tajikistan's peace process. Inadequate disarmament rates were disregarded, but integration of opposition fighters into military and law enforcement units was relatively swift. This created high levels of trust among the former fighters and commanders. The quick provision of incentives, such as comprehensive amnesties and the offer of government positions and economic assets created stakes in the peace process for a number of actors. Transitional justice was largely overlooked. In this way, the case of Tajikistan runs counter to key elements of what has been termed the ‘post-conflict reconstruction orthodoxy’. At the same time, Tajikistan is a rare example of the emergence of post-war stability. This article provides a detailed account of the DDR process and outlines the incentives that it created for the warring parties. It also assesses the emergence of spoilers and the government's counter strategies. The article concludes by highlighting the consolidation of President Rakhmonov's power since 2001, but also raises some questions regarding the viability of Tajikistan's long-term political and economic development. 相似文献
45.
46.
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
47.
48.
49.
Correlation between plasma and bone marrow tricyclic antidepressants has not been studied before. Two groups of rabbits were given 10 and 20 mg of desipramine/kg body weight, respectively. Desipramine was administered to the animals once daily by mouth for 5 days. On the fifth day the animals were sacrificed and blood and bone marrow samples were collected and analyzed using a high performance liquid chromatographic (HPLC) method. Data showed that a correlation exists between bone marrow and blood desipramine. The bone marrow desipramine concentration increased as its blood levels increased. The average ratio of bone marrow to blood desipramine +/- S.D. (standard deviation) in both dosage groups was 37.2 +/- 4.46 with a range of 30.99-44.82. This investigation is promising and shows that bone marrow could be used as an alternative tissue in the absence of a suitable blood sample. 相似文献
50.
Carol S. Bruch 《Family Court Review》1993,31(1):101-107
This article examines voluntary mediation and provides suggested criteria for attorneys in deciding whether or not to use mediation. The author discusses what mediation has to offer, what it takes to make it work, and important cautions for attorneys in deciding about the use of this process. 相似文献