全文获取类型
收费全文 | 14185篇 |
免费 | 1290篇 |
专业分类
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 |
出版年
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
941.
942.
A total of 743 lethal outcomes of thromboembolytic complications of trauma, diseases and certain pathological conditions as observed in 1999-2001 and in the three quarters of 2002 were studied. The undertaken analysis confirmed two factors provoking the pathological thrombosis, i.e. 1. Pathological changes observed in the surface vascular wall preconditioned by mechanical damages, atherosclerotic process and aging; and 2. A slower blood flow due to an impaired blood circulation, a forced positioning and to hypodynamics. While deciding on a possibility of a direct cause-effect relation between past traumas, surgeries, poisonings and death of thromboembolism of the pulmonary arteries (TEPA), such relation can be mentioned only on rare occasions. It is more often the case that an indirect, mediated relationship is found, when TERA evolves due to an unfavorable combination of risk factors, i.e. a forced immobility, changing coagulated blood system, impaired blood vessels etc. 相似文献
943.
Bogomolova IH 《Sudebno-meditsinskaia ekspertiza》2003,46(2):16-20
The results of histomorphometric examinations of the pancreas in drug- and alcohol-addiction as well as in acute intoxications are described. They show that, in chronic alcoholic intoxication as compared with opiomania, there are more pronounced interlobular sclerosis and lipomatosis, which is manifested by an enlarged middle lobe of the stroma (containing fat and connective tissue fibers), by a higher density of islands of Langerhans and by their higher sectional area. Autolysis and edema of the stroma are more severe in an acute intoxication with drugs than in other cases of fatal outcome. A possibility is demonstrated to differentiate between various types of the so-called long-term exogenous intoxication and to discriminate between different types of thanatogenesis typical of various cases of acute intoxications. Data are presented that demonstrate the advantage of the quantitative analysis of histological preparations over the qualitative one. 相似文献
944.
Eighteen cadavers of persons, who died of acute and chronic alcohol and drug intoxication (ephedron-addiction), were used to study the changes in the spinal nerve plexuses and external genitals. The activity of acetylcholinesterase and of NADPH-diaphorase was determined histochemically; the adrenergic nerve fibers were detected by a glyoxyl-acid technique. Rectified changes in the relative density of adrenal-cholinergic- and nitroxydergic structures and in the activity of mediators in different intoxications were found. The chronic intoxication by alcohol and ephedron was accompanied by a reduced activity of enzymes involved in the metabolism of acetylcholine, nitric oxide and catecholamines. A lower density was observed in the nerve fibers that contained the examined substances. The results can be used as an additional criterion in evaluating the male sexual-function status. 相似文献
945.
946.
Determination of 2.4-dinitrophenol,its basic metabolite and 4-oxide diphenyl in biological materials
A possibility was considered to isolate, by using dimethylformamide, 2.4-dinitrophenol, 2-amino-4-nitrophenol and 4-oxid-diphenyl from a biological-origin object. A method of extraction with subsequent chromatography in thin silicon-gel layer was used to purify the isolates from biological materials. The designed technique provides for identifying and for quantitatively defining the discussed phenol structures contained in the isolates from the liver tissue of corpses and human blood. 相似文献
947.
Introduction
Introduction to special issue on professional insecurities 相似文献948.
Commentary
Commentaries on Brunner and Willards professional insecurities 相似文献949.
Scholars of legislative studies typically use ideal point estimatesfrom scaling procedures to test theories of legislative politics.We contend that theory and methods may be better integratedby directly incorporating maintained and to be tested hypothesesin the statistical model used to estimate legislator preferences.In this view of theory and estimation, formal modeling (1) providesauxiliary assumptions that serve as constraints in the estimationprocess, and (2) generates testable predictions. The estimationand hypothesis testing procedure uses roll call data to evaluatethe validity of theoretically derived to be tested hypothesesin a world where maintained hypotheses are presumed true. Wearticulate the approach using the language of statistical inference(both frequentist and Bayesian). The approach is demonstratedin analyses of the well-studied Powell amendment to the federalaid-to-education bill in the 84th House and the Compromise of1790 in the 1st House. 相似文献
950.