全文获取类型
收费全文 | 1753篇 |
免费 | 103篇 |
专业分类
各国政治 | 117篇 |
工人农民 | 78篇 |
世界政治 | 180篇 |
外交国际关系 | 148篇 |
法律 | 755篇 |
中国共产党 | 1篇 |
中国政治 | 22篇 |
政治理论 | 530篇 |
综合类 | 25篇 |
出版年
2023年 | 21篇 |
2022年 | 10篇 |
2021年 | 16篇 |
2020年 | 50篇 |
2019年 | 68篇 |
2018年 | 71篇 |
2017年 | 80篇 |
2016年 | 77篇 |
2015年 | 60篇 |
2014年 | 82篇 |
2013年 | 255篇 |
2012年 | 66篇 |
2011年 | 68篇 |
2010年 | 53篇 |
2009年 | 68篇 |
2008年 | 69篇 |
2007年 | 62篇 |
2006年 | 53篇 |
2005年 | 56篇 |
2004年 | 58篇 |
2003年 | 47篇 |
2002年 | 48篇 |
2001年 | 39篇 |
2000年 | 38篇 |
1999年 | 21篇 |
1998年 | 20篇 |
1997年 | 20篇 |
1996年 | 17篇 |
1995年 | 31篇 |
1994年 | 6篇 |
1993年 | 17篇 |
1992年 | 18篇 |
1991年 | 12篇 |
1990年 | 15篇 |
1989年 | 16篇 |
1988年 | 10篇 |
1987年 | 12篇 |
1986年 | 15篇 |
1985年 | 9篇 |
1984年 | 14篇 |
1983年 | 7篇 |
1982年 | 10篇 |
1981年 | 8篇 |
1980年 | 6篇 |
1979年 | 9篇 |
1977年 | 7篇 |
1976年 | 5篇 |
1973年 | 4篇 |
1969年 | 4篇 |
1968年 | 4篇 |
排序方式: 共有1856条查询结果,搜索用时 15 毫秒
121.
122.
123.
124.
125.
126.
127.
128.
Christopher Kinsey 《冲突、安全与发展》2005,5(3):269-293
Since the end of the Cold War, there has been a marked increase in the sale of military services by private security companies (PSCs).1 These companies sell anything from combat support for government military operations to military training and assistance, logistical support and more conventional security protection services. They have undertaken operations in countries as diverse as Sierra Leone, Croatia, and Columbia and now Iraq and Afghanistan. The presence of these companies on the international stage raises fundamental questions about the way war is now being fought. Unfortunately, the legal issues raised by their presence in conflicts have not yet been properly addressed. This article sets out to examine the suitability of international law in defining and controlling the activities of PSCs on the battlefield. It then goes on to discuss the problems associated with national regulation. Here the focus is on the attempts by the United States (US), South Africa, and United Kingdom (UK) governments to introduce effective legislation to control the industry. 相似文献
129.
Animal-derived trace evidence is a common finding at crime scenes and may provide an important link between victim(s) and suspect(s). A database of 558 dogs of pure and mixed breeds is described and analyzed with two PCR multiplexes of 17 microsatellites. Summary statistics (number of alleles, expected and observed heterozygosity and power of exclusion) are compared between breeds. Marked population substructure in dog breeds indicates significant inbreeding, and the use of a conservative theta value is recommended in likelihood calculations for determining the significance of a DNA match. Evidence is presented that the informativeness of the canine microsatellites, despite inbreeding, is comparable to the human CODIS loci. Two cases utilizing canine DNA typing, State of Washington v. Kenneth Leuluaialii and George Tuilefano and Crown v. Daniel McGowan, illustrate the potential of canine microsatellite markers for forensic investigations. 相似文献
130.
Latkoczy C Becker S Dücking M Günther D Hoogewerff JA Almirall JR Buscaglia J Dobney A Koons RD Montero S van der Peijl GJ Stoecklein WR Trejos T Watling JR Zdanowicz VS 《Journal of forensic sciences》2005,50(6):1327-1341
Forensic analysis of glass samples was performed in different laboratories within the NITE-CRIME (Natural Isotopes and Trace Elements in Criminalistics and Environmental Forensics) European Network, using a variety of Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) systems. The main objective of the interlaboratory tests was to cross-validate the different combinations of laser ablation systems with different ICP-MS instruments. A first study using widely available samples, such as the NIST SRM 610 and NIST SRM 612 reference glasses, led to deviations in the determined concentrations for trace elements amongst the laboratories up to 60%. Extensive discussion among the laboratories and the production of new glass reference standards (FGS 1 and FGS 2) established an improved analytical protocol, which was tested on a well-characterized float glass sample (FG 10-1 from the BKA Wiesbaden collection). Subsequently, interlaboratory tests produced improved results for nearly all elements with a deviation of < 10%, demonstrating that LA-ICP-MS can deliver absolute quantitative measurements on major, minor and trace elements in float glass samples for forensic and other purposes. 相似文献