全文获取类型
收费全文 | 9599篇 |
免费 | 294篇 |
专业分类
各国政治 | 659篇 |
工人农民 | 396篇 |
世界政治 | 763篇 |
外交国际关系 | 393篇 |
法律 | 5433篇 |
中国共产党 | 2篇 |
中国政治 | 143篇 |
政治理论 | 2013篇 |
综合类 | 91篇 |
出版年
2020年 | 126篇 |
2019年 | 146篇 |
2018年 | 223篇 |
2017年 | 235篇 |
2016年 | 244篇 |
2015年 | 200篇 |
2014年 | 210篇 |
2013年 | 1184篇 |
2012年 | 245篇 |
2011年 | 329篇 |
2010年 | 242篇 |
2009年 | 253篇 |
2008年 | 264篇 |
2007年 | 248篇 |
2006年 | 245篇 |
2005年 | 207篇 |
2004年 | 232篇 |
2003年 | 256篇 |
2002年 | 177篇 |
2001年 | 359篇 |
2000年 | 342篇 |
1999年 | 298篇 |
1998年 | 152篇 |
1997年 | 109篇 |
1996年 | 114篇 |
1995年 | 104篇 |
1994年 | 114篇 |
1993年 | 107篇 |
1992年 | 170篇 |
1991年 | 161篇 |
1990年 | 153篇 |
1989年 | 143篇 |
1988年 | 160篇 |
1987年 | 161篇 |
1986年 | 164篇 |
1985年 | 161篇 |
1984年 | 148篇 |
1983年 | 161篇 |
1982年 | 103篇 |
1981年 | 74篇 |
1980年 | 84篇 |
1979年 | 103篇 |
1978年 | 80篇 |
1977年 | 71篇 |
1976年 | 70篇 |
1975年 | 60篇 |
1973年 | 56篇 |
1972年 | 55篇 |
1971年 | 55篇 |
1969年 | 55篇 |
排序方式: 共有9893条查询结果,搜索用时 0 毫秒
21.
Research has indicated that school factors such as communal school organization and student bonding are predictive of school disorder, with greater communal organization and greater student bonding leading to less delinquency and victimization. Data from a nationally representative sample of 254 public, nonalternative, secondary schools were used to examine structural equation models representing hypothesized relationships among communal school organization, student bonding, and school disorder. The hypothesis that communally organized schools would have less disorder held true for teacher victimization and student delinquency, but not for student victimization. In addition, the hypothesis that the relationship between communal school organization and school disorder would be mediated by student bonding was supported for student delinquency, but not for teacher victimization. 相似文献
22.
23.
24.
25.
We investigated the differences in the levels of carboxyhemoglobin (COHb), cyanide (HCN) and petroleum fuels (gasoline and kerosene) between left and right ventricular bloods from fire victims. COHb was slightly, and HCN and petroleum fuels were markedly higher levels in the left than those in the right. These effects were so called 'first pass phenomena' due to the circulation, diffusion and metabolization before the deaths of fire victims. 相似文献
26.
27.
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
28.
29.
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
30.
It is a central tenet of most contemporarytheories of justice that the badly-off have aright to some of the resources of the well-off.In this paper, I take as my starting point twoprinciples of justice, to wit, the principle ofsufficiency, whereby individuals have a rightto the material resources they need in order tolead a decent life, and the principle ofautonomy, whereby once everybody has such alife, individuals should be allowed to pursuetheir conception of the good, and to enjoy thefruits of their labour in pursuit of suchconception. I also endorse the value offairness, whereby the right person orinstitution makes the decision as to whether tobring about justice.I show that justice and fairness can besatisfied only if we all enjoy a combination ofprivate and collective rights over the world.In making that case, I shall argue that the setof ownership rights I advocate differs fromreadily available conceptions of restrictedprivate ownership in two important respects.First, it is such that in some circumstances,two individuals or more can have control rightsover the same property at the same time, not,as is standardly the case in legal systems, bycontracting with one another (through gifts andjoint purchase), but simply on grounds ofjustice. Second, it allows that, if necessary,property-owners be expropriated from theirproperty without compensation. 相似文献