全文获取类型
收费全文 | 3542篇 |
免费 | 97篇 |
专业分类
各国政治 | 252篇 |
工人农民 | 137篇 |
世界政治 | 319篇 |
外交国际关系 | 196篇 |
法律 | 1500篇 |
中国政治 | 15篇 |
政治理论 | 1178篇 |
综合类 | 42篇 |
出版年
2021年 | 13篇 |
2020年 | 48篇 |
2019年 | 51篇 |
2018年 | 69篇 |
2017年 | 76篇 |
2016年 | 102篇 |
2015年 | 59篇 |
2014年 | 83篇 |
2013年 | 592篇 |
2012年 | 73篇 |
2011年 | 97篇 |
2010年 | 92篇 |
2009年 | 90篇 |
2008年 | 107篇 |
2007年 | 116篇 |
2006年 | 99篇 |
2005年 | 98篇 |
2004年 | 104篇 |
2003年 | 109篇 |
2002年 | 154篇 |
2001年 | 81篇 |
2000年 | 78篇 |
1999年 | 84篇 |
1998年 | 64篇 |
1997年 | 78篇 |
1996年 | 57篇 |
1995年 | 46篇 |
1994年 | 40篇 |
1993年 | 49篇 |
1992年 | 54篇 |
1991年 | 59篇 |
1990年 | 42篇 |
1989年 | 54篇 |
1988年 | 44篇 |
1987年 | 43篇 |
1986年 | 56篇 |
1985年 | 47篇 |
1984年 | 30篇 |
1983年 | 55篇 |
1982年 | 43篇 |
1981年 | 32篇 |
1980年 | 28篇 |
1979年 | 25篇 |
1978年 | 24篇 |
1977年 | 22篇 |
1976年 | 26篇 |
1975年 | 19篇 |
1974年 | 28篇 |
1972年 | 13篇 |
1971年 | 14篇 |
排序方式: 共有3639条查询结果,搜索用时 15 毫秒
301.
302.
303.
304.
Jess Alderman Jason A. Smith Ellen J. Fried Richard A. Daynard 《The Journal of law, medicine & ethics》2007,35(1):90-112
Childhood obesity is in important respects a result of legal policies that influence both dietary intake and physical activity. The law must shift focus away from individual risk factors alone and seek instead to promote situational and environmental influences that create an atmosphere conducive to health. To attain this goal, advocates should embrace a population-wide model of public health, and policymakers must critically examine the fashionable rhetoric of consumer choice. 相似文献
305.
306.
N,N-diethyl-m-toluamide (DEET) levels in postmortem specimens of stomach and contents, blood, liver, and urine are reported following ingestion of the compound. DEET was analyzed by gas chromatography with an OV-101 column and a nitrogen phosphorus detector. The presence of the compound in the four postmortem specimens was confirmed by mass spectrometry. 相似文献
307.
308.
Isotope ratio mass spectrometry as a tool for forensic investigation (examples from recent studies).
James F Carter Richard Sleeman Jenny C Hill Fay Idoine Emma L Titterton 《Science & justice》2005,45(3):141-149
The versatility of isotope ratio mass spectrometry is demonstrated by reference to diverse case studies. Variations in the natural isotopic composition of non-biological, organic materials are compared as a means by which samples may be associated or discriminated. These techniques may be used to augment or compliment conventional forensic methodologies. delta13C analysis was used to demonstrate that different masking tape had been recovered in two, apparently similar cases, involving the smuggling of money. Visually similar ecstasy tablets were compared by consideration of the delta13C and delta15N composition of MDMA extracted from the tablets. Although only a limited number of tablets were analysed, the isotopic similarity between two different seizures was sufficient to induce a guilty plea from a person suspected of possessing both. A combination of delta2H, delta13C, delta15N and delta18O together with GC-MS analyses were applied to small samples of seized heroin. Although GC-MS analysis indicated differences between the chemical composition of two of the heroin samples, isotopic analysis suggested similarities, which were confirmed by further delta2H, delta13C and delta18O isotopic analysis of the clingfilm in which the samples were wrapped. 相似文献
309.
Anti‐Americanism, sometimes called the “last acceptable prejudice”, is a common phenomenon in the modern era. This paper explores the ebb and flow of anti‐Americanism in the Australian Labor Party in the post‐Second World War period and argues that while at times it was reasonable or proportionate, at others such criticism became unreasonable, disproportionate and therefore prejudicial. When this occurs the Australia‐US alliance can become strained, the Australian electorate tends to become sceptical of the ALP's credentials on national security and the party's electoral prospects also tend to suffer. Nevertheless, following the brief leadership of the stridently anti‐American Mark Latham, such sentiment in the ALP has been widely discredited and is unlikely to emerge again in its prejudicial form for some time, marking the end of an era. 相似文献
310.