首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   14185篇
  免费   1290篇
各国政治   560篇
工人农民   451篇
世界政治   1039篇
外交国际关系   383篇
法律   10694篇
中国共产党   1篇
中国政治   98篇
政治理论   2159篇
综合类   90篇
  2020年   373篇
  2019年   365篇
  2018年   418篇
  2017年   502篇
  2016年   515篇
  2015年   459篇
  2014年   460篇
  2013年   1394篇
  2012年   337篇
  2011年   434篇
  2010年   570篇
  2009年   514篇
  2008年   332篇
  2007年   316篇
  2006年   411篇
  2005年   304篇
  2004年   293篇
  2003年   288篇
  2002年   265篇
  2001年   568篇
  2000年   452篇
  1999年   363篇
  1998年   164篇
  1997年   146篇
  1996年   121篇
  1995年   149篇
  1994年   162篇
  1993年   136篇
  1992年   274篇
  1991年   297篇
  1990年   273篇
  1989年   308篇
  1988年   289篇
  1987年   246篇
  1986年   281篇
  1985年   285篇
  1984年   250篇
  1983年   224篇
  1982年   165篇
  1981年   158篇
  1980年   141篇
  1979年   171篇
  1978年   110篇
  1977年   106篇
  1976年   85篇
  1975年   100篇
  1974年   105篇
  1973年   93篇
  1972年   87篇
  1971年   80篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
901.
902.
Described in the paper are the study results of the stomatological status of 385 cadavers, in whom the frequency rate of anomalies of separate teeth and of their varieties were evaluated as applicable to the personality identification tasks.  相似文献   
903.
904.
905.
While analyzing the available published data, we found significant differences in definition of alleles of the HUMCD4 polymorphic chromosome locus. It is an obstacle for comparing the expertise results obtained while using the locus as molecular individualization system in different laboratories and, as a consequence, it hinders the use of the said marker in building up a reference database. The structure of the HUMCD4 locus was analytically investigated and the distribution of the locus alleles was systemized in a sample of 407 persons (citizens of Russia who are not blood relatives) within the present case study for the purpose of a detailed definition of its allele's characteristics. We worked out recommendations related with the nomenclature standardization of alleles of the HIMCD4 locus and specified the main population features of the locus polymorphism on the bases of the studied sample of Russia's citizens. The results can be used as reference parameters in interpreting the findings of the molecular-genetic identification expertise and examinations and in building up databases.  相似文献   
906.
Data are reported on toxicity of a majority of non-steroid anti-inflammatory drugs (NSAD), which are the most frequently used in clinical practice and whose chemical structures are different. The action mechanism and side effects of some NSAD, in particular, of diclofenac, ibuprofen and indometacin, are also in the focus of attention.  相似文献   
907.
Allelic frequencies of chromosome micro-satellite locuses D16S539, F13B, FESFPS, TH01 and TPOX were determined, within the case study, in a sampling of Europeoidal individuals residing in Russia's Ural Region. The allelic variants were analyzed by capillary electrophoresis after the enzyme amplification in polymerase chain reaction with fluorescent primers. The genotypic frequencies of the studied locuses were shown not to divert with statistical reliability from Hardy-Weinberg equilibrium. The estimated aggregate discriminative potential for a panel of 5 studied locuses made 0.99995. No nonequilibrium was found by linkage between alleles of all lucuses examined within the present case study or between their alleles and the alleles of previously investigated locuses D7S820 and D13S317. The implemented testing of the population homogeneity of allelic frequencies of investigated locuses for 3 samplings of Europeoids showed a deviation for locus FESFPS versus the Ural and Polish samplings and for locus F13B in the Ural and North America samplings. The distribution of allelic frequencies of other locuses was homogenous in the compared samplings.  相似文献   
908.
The shaped-up experience of management and implementation of expertise as applicable to civil and criminal cases and with respect to the requirements of new legislative acts was analyzed. Issues connected with composing a commission of experts, with the range of competence of forensic medical expert and of clinical practitioner, as well as with the content and form of the expert conclusions are under discussion.  相似文献   
909.
910.
A total of 137 urine samples and 46 serum samples, corresponding to 154 self-confessed designer drugs consumers in Ibiza island, were analyzed for the presence of designer drugs: amphetamine and amphetamine derivatives (methamphetamine, methylenedioxymethamphetamine (MDMA), methylenedioxyethylamphetamine (MDEA), methylenedioxyamphetamine (MDA), p-methoxymethylamphetamine (PMMA), p-methoxyamphetamine (PMA), etc.), ketamine and gamma-hydroxybutyric acid. Among this population, coming both from the forensic clinic and from the emergency room of a hospital, a total of 99 cases were found positive for some designer drug. This study shows the prevalence of methylenedioxymethamphetamine (MDMA) among designer drug users, sole or in association with other drugs. Also, the mixture of MDMA with other designer drugs, ethanol and/or cocaine is shown to be more likely to produce toxic symptoms requiring clinical attendance in a hospital emergency room. These findings along with the consumption history, the concentrations of drugs and metabolites in urine and serum and the toxicological significance for the interpretation of some MDMA metabolites such as 4-hydroxy-3-methoxymethamphetamine (HMMA) are discussed in this study.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号