全文获取类型
收费全文 | 11002篇 |
免费 | 108篇 |
专业分类
各国政治 | 398篇 |
工人农民 | 378篇 |
世界政治 | 725篇 |
外交国际关系 | 359篇 |
法律 | 6780篇 |
中国政治 | 67篇 |
政治理论 | 2315篇 |
综合类 | 88篇 |
出版年
2020年 | 113篇 |
2019年 | 167篇 |
2018年 | 191篇 |
2017年 | 219篇 |
2016年 | 218篇 |
2015年 | 170篇 |
2014年 | 189篇 |
2013年 | 949篇 |
2012年 | 223篇 |
2011年 | 272篇 |
2010年 | 212篇 |
2009年 | 271篇 |
2008年 | 278篇 |
2007年 | 278篇 |
2006年 | 269篇 |
2005年 | 245篇 |
2004年 | 240篇 |
2003年 | 250篇 |
2002年 | 238篇 |
2001年 | 426篇 |
2000年 | 372篇 |
1999年 | 301篇 |
1998年 | 165篇 |
1997年 | 123篇 |
1996年 | 137篇 |
1995年 | 133篇 |
1994年 | 134篇 |
1993年 | 141篇 |
1992年 | 234篇 |
1991年 | 253篇 |
1990年 | 242篇 |
1989年 | 252篇 |
1988年 | 226篇 |
1987年 | 228篇 |
1986年 | 263篇 |
1985年 | 260篇 |
1984年 | 232篇 |
1983年 | 217篇 |
1982年 | 152篇 |
1981年 | 128篇 |
1980年 | 115篇 |
1979年 | 153篇 |
1978年 | 88篇 |
1977年 | 114篇 |
1976年 | 98篇 |
1975年 | 77篇 |
1974年 | 95篇 |
1973年 | 86篇 |
1972年 | 79篇 |
1971年 | 72篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
851.
852.
R Weinstock 《Journal of forensic sciences》1986,31(2):596-602
A survey was made of American Academy of Forensic Sciences (AAFS) forensic psychiatrists to evaluate whether there is concern among them about potential ethical problems in criminal justice work. Of the respondents, 93.8% had encountered such problems. The main concerns indicated were about those psychiatrists who become a "hired gun," become an advocate, do not give an honest opinion, or have problems with confidentiality. The need for ethical guidelines and further debate about ethical issues is presented. 相似文献
853.
Demographic and trend analysis of 881 consecutive suicides in blacks and whites is presented. For the years 1975 through 1984, the suicide rate was 15.1/100 000 and did not significantly change. White males were overrepresented in all age groups, had an overall suicide rate of 34.9, and showed a small but statistically significant increase in rate which was not accounted for by any specific age group. White females, in general, were represented in proportion to their prevalence in the population, and those ages 20 to 24 demonstrated an increasing suicide rate which was small. Black males were at highest risk in their twenties, showed no significant trends, and were also represented near their prevalence in the population. Black females of all ages were underrepresented, and had low suicide rates which decreased with time. No significant rate changes were noted for teenagers or the elderly. Firearms was the method of choice in all groups, although methods varied with age, race, and sex, and male children preferred hanging. Small but significant increases were noted for the prevalence of nondrug methods in females and carbon monoxide deaths in white males. Similarities and differences to larger scale studies are discussed. Suicide may have characteristics unique to given geographical areas and pervasive to all areas. The authors advocate study and publication of local data to clarify further the nature of suicide. 相似文献
854.
A method is described for the gas chromatographic quantitation of carbon monoxide by means of thermal conductivity detection. Carbon monoxide is released from blood samples as small as 0.02 mL using a unique extraction chamber. The method was compared to a standard gas chromatographic and spectrophotometric method of carbon monoxide quantitation. It was comparable to the former with all samples evaluated and apparently more reliable than the latter with decomposed samples. 相似文献
855.
F. Carabellese C. Barbieri R. Catanesi 《The journal of forensic psychiatry & psychology》2015,26(1):1-10
Purpose: in the literature, the term ‘Internet crime’ has been coined to indicate the scenario in which a victim of homicide or other crimes is met through a chat room, and lured to death at the hands of the murderer. Various criticisms have been made of this new concept, on the grounds that the outcome is no different from that of other crimes committed without the use of Web resources, and so the method used has no particular influence. Indeed, it has been claimed that informatic crime just reflects a technological change in the nature of crime rather than a new form of criminal behavior attributable to the use of the Internet for criminal purposes. Method: our reflections were prompted by our experience as expert forensic psychiatry witnesses in three cases in which the aggressors had confessed to having had an exclusively virtual relationship with the victims, in which they spent a lot of time daily in a chat room. Conclusion: this scenario offers points for reflection on the nature of Web-mediated victim–aggressor interactions, to assess the effects on the planning and commission of the crime. Discussion. it’s our opinion that there really is such a thing as Internet-correlated crime, because in this case the quality and quantity of the Internet interactions progressively altered the men’s perception of the real relationship between themself and their victims. 相似文献
856.
857.
By potential damage, chemical terroristic attacks are much more dangerous than terroristic bombing. To fight chemical terrorism it is necessary to create the system of medical-environmental defense of the population. In line with emergency medicine, forensic medical service is a very important element of the antiterroristic defense. The activity of forensic-medical experts in the field of terroristic chemical attack is analysed. 相似文献
858.
Thirty years have passed since the publication of "Cross-Subsidization:Pricing in Public Enterprises." The article rigorously definedcross-subsidization and is now a standard citation of regulatorsand scholars addressing the pricing of regulated multiproductfirms. The incremental cost test and the stand-alone cost test,however, have often been misunderstood and misapplied. Thisarticle answers the most common questions that have arisen inthe application of these tests for cross-subsidization and correctsthe most common errors that have been committed in their application. 相似文献
859.
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
860.
Postmortem examination of a former professional basketball player revealed an abnormal heart, most notably a single coronary artery. The literature on single coronary arteries is briefly reviewed, and the possible mechanism which caused the patient's condition is considered. This case is particularly unusual because of the patient's profession, which is so physically demanding. 相似文献