全文获取类型
收费全文 | 9848篇 |
免费 | 235篇 |
专业分类
各国政治 | 682篇 |
工人农民 | 417篇 |
世界政治 | 735篇 |
外交国际关系 | 485篇 |
法律 | 5549篇 |
中国政治 | 66篇 |
政治理论 | 2079篇 |
综合类 | 70篇 |
出版年
2020年 | 105篇 |
2019年 | 135篇 |
2018年 | 177篇 |
2017年 | 222篇 |
2016年 | 236篇 |
2015年 | 155篇 |
2014年 | 208篇 |
2013年 | 1243篇 |
2012年 | 202篇 |
2011年 | 246篇 |
2010年 | 235篇 |
2009年 | 246篇 |
2008年 | 264篇 |
2007年 | 292篇 |
2006年 | 274篇 |
2005年 | 218篇 |
2004年 | 249篇 |
2003年 | 244篇 |
2002年 | 212篇 |
2001年 | 329篇 |
2000年 | 292篇 |
1999年 | 266篇 |
1998年 | 149篇 |
1997年 | 130篇 |
1996年 | 108篇 |
1995年 | 106篇 |
1994年 | 116篇 |
1993年 | 119篇 |
1992年 | 155篇 |
1991年 | 186篇 |
1990年 | 188篇 |
1989年 | 176篇 |
1988年 | 179篇 |
1987年 | 193篇 |
1986年 | 186篇 |
1985年 | 178篇 |
1984年 | 153篇 |
1983年 | 140篇 |
1982年 | 92篇 |
1981年 | 107篇 |
1980年 | 92篇 |
1979年 | 140篇 |
1978年 | 93篇 |
1977年 | 88篇 |
1976年 | 70篇 |
1975年 | 88篇 |
1974年 | 93篇 |
1973年 | 90篇 |
1972年 | 60篇 |
1971年 | 60篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
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
32.
33.
Attributions of blame for the first and latest episodes of violence were assessed in a sample of 139 couples who were referred to a mandatory domestic violence treatment program in the military. Use of a methodology which allows for reports of nonmutually exclusive categories of attribution from both members of the dyad revealed more complex patterns of attributions than reflected in the existing literature. In addition, there were low rates of agreement within couples as to who was to blame for the violence. Although both men and women exhibited a high frequency of blaming their partner for both episodes of violence, men were significantly more likely to blame themselves for the latest than for the first episode. Attributions of blame were related to contextual variables in both men and women. Sex specific relationships emerged. These results were discussed with specific reference to predictions derived from attribution theory and their clinical implications. 相似文献
34.
Isolation of the DNA minisatellite probe MZ 1.3 and its application to DNA 'fingerprinting' analysis 总被引:1,自引:0,他引:1
U Schacker P M Schneider B Holtkamp E Bohnke R Fimmers H H Sonneborn C Rittner 《Forensic science international》1990,44(2-3):209-224
A minisatellite probe, MZ 1.3, detecting hypervariable fragment patterns was isolated from a human genomic library. A repetitive sequence of 27 bp length was identified which is contained in the probe approx. 40 times. The MZ 1.3 repeat shows variable homology of 53-73% to the repetitive sequence of the protein III gene of the bacteriophage M13 genome. Polymorphic restriction fragment patterns were found with MZ 1.3 using the enzymes Hinf I, BstN I, Hae III, Mbo I, PstI/Pvu II, and Rsa I. An average of 18 polymorphic fragments was observed using Hinf I as enzyme. The band sharing frequency after Hinf I digestion among unrelated individuals was determined to be 23.8 +/- 7.2%. An example for the application of MZ 1.3 to paternity testing in an incest case is given. The probe can be used with radioactive or non-radioactive detection systems. An approach is presented to compare polymorphic fragment patterns from individuals obtained by independent gel runs on the basis of relative band positions (RBP) and calculated in a computerized analysis. 相似文献
35.
Rebecca Emerson Stephen G. Hall Anna Zalewska-Mitura 《Economic Change and Restructuring》1997,30(2-3):75-90
With new technically advanced methods and computers at our disposal, the efficient market hypothesis is once again being debated. At the same time, we are witnessing an unprecedented growth in both existing and new financial markets. These new markets are often in economies which have just recently embraced free market economics; we term these stock markets infant markets. Such stock markets are obviously not efficient in allocating the supply of savings to productive capital. We do not test whether or not these infant markets are informationally efficient, but instead examine whether and how they are becoming more efficient. We propose modelling the excess returns of individual securities using a multi-factor model with time-varying coefficients and generalised auto-regressive conditional heteroskedastic (GARCH) errors. If the markets are becoming more informationally efficient or the agents are learning, we would expect this to manifest itself as the time-varying coefficients becoming more stable as time increases. We test our model using data on four Bulgarian shares. First, we estimate an AR(2) model and a GARCH-M(1,1) model for the shares. Then, we estimated our AR(2) model with time varying coefficients and GARCH type errors. We find varying levels of efficiency and varying speeds of movement towards efficiency within our sample of four shares. 相似文献
36.
Comparison of a suspected biter's dental arches with the patterned injury of a bite mark is especially difficult when the bite occurs in an anatomic location with a small radius of curvature or with complex or compound curves. The authors present two case reports in which human skin was used as a template for the reproduction of a bite. In one case the victim's skin was used; in the other, the skin of a anatomically similar person was used. The use of inked dental casts, photography, and transparent overlays significantly reduced the errors common to analysis of bite marks in these highly curved areas. 相似文献
37.
Identification of the driver in two-rider motorcycle accidents. Inguinal contusion-laceration as an indication of the driver 总被引:1,自引:0,他引:1
H Shiono A Akane K Matsubara K Tanabe S Takahashi 《The American journal of forensic medicine and pathology》1990,11(3):190-192
In motorcycle accidents involving two riders, medicolegal identification of the driver is necessary when one or both riders die. It is particularly important in the latter case, because the survivor almost always insists that he or she was not driving. One characteristic injury that distinguishes the driver from the passenger is inguinal contusion-laceration (accompanied internally by pelvic fracture). This injury, caused by collision of the pelvis with the fuel tank, identifies the driver. 相似文献
38.
39.
Compared to other continental European countries, especially Germany and Switzerland, which have experimented with New Public Management (NPM) in local government, The Netherlands has been relatively quick in following trends stemming from Anglo-Saxon management thinking, but also relatively quick in redressing its course. The rise of the New Public Management in Dutch local government has been relatively swift and strong but also relatively superficial and non‐committal. The dominant picture that emerges is one of an administrative system that, while responsive to the latest trends, is also surprisingly stable. Management reforms, forcefully advocated in the 1980s, were decisively revised and redressed in the 1990s, with the city of Tilburg, celebrated for its 'Tilburg Model', a case in point. The Werdegang of NPM (that is, how things developed) in Dutch local government, detailed in this article, can be understood only partially as a result of changing economic and budgetary constraints. The article shows that endogenous features of the Dutch politico-administrative system – more specifically: the compact, dense and decentralized pattern of the intergovernmental network, the administrative tradition of pragmatism, dynamic conservatism and the comparatively technocratic character of local government – have also strongly influenced the reception, effect and correction of NPM in Dutch local government. 相似文献
40.
This article argues that, despite environmental issues climbing higher on the political agenda and considerable recent policy activity, rhetoric is not matched by reality in our efforts to manage the Australian environment. We integrate the imperatives emerging from the policy and sustainability literatures and from actual policy, with detailed work on wildlife conservation in Victoria's Central Highlands. Our analysis demonstrates that, rather than undertaking the more intensive policy and 'adaptive management' that is needed, governments are often doing less and may actually be 'taking their hands of their wheel'. Some public policy and administration implications of the emerging policy field of sustainability are illustrated. 相似文献