全文获取类型
收费全文 | 4931篇 |
免费 | 59篇 |
专业分类
各国政治 | 120篇 |
工人农民 | 237篇 |
世界政治 | 157篇 |
外交国际关系 | 121篇 |
法律 | 3816篇 |
中国政治 | 25篇 |
政治理论 | 473篇 |
综合类 | 41篇 |
出版年
2021年 | 20篇 |
2020年 | 34篇 |
2019年 | 34篇 |
2018年 | 134篇 |
2017年 | 56篇 |
2016年 | 152篇 |
2015年 | 49篇 |
2014年 | 57篇 |
2013年 | 262篇 |
2012年 | 214篇 |
2011年 | 220篇 |
2010年 | 89篇 |
2009年 | 84篇 |
2008年 | 122篇 |
2007年 | 141篇 |
2006年 | 126篇 |
2005年 | 478篇 |
2004年 | 230篇 |
2003年 | 140篇 |
2002年 | 124篇 |
2001年 | 170篇 |
2000年 | 139篇 |
1999年 | 116篇 |
1998年 | 21篇 |
1993年 | 27篇 |
1992年 | 78篇 |
1991年 | 102篇 |
1990年 | 112篇 |
1989年 | 128篇 |
1988年 | 124篇 |
1987年 | 116篇 |
1986年 | 102篇 |
1985年 | 104篇 |
1984年 | 78篇 |
1983年 | 73篇 |
1982年 | 25篇 |
1981年 | 20篇 |
1979年 | 38篇 |
1978年 | 42篇 |
1977年 | 28篇 |
1976年 | 27篇 |
1975年 | 42篇 |
1974年 | 56篇 |
1973年 | 49篇 |
1972年 | 49篇 |
1971年 | 51篇 |
1970年 | 48篇 |
1969年 | 42篇 |
1968年 | 37篇 |
1967年 | 22篇 |
排序方式: 共有4990条查询结果,搜索用时 15 毫秒
991.
The flow of foreign direct investment into developing countries varies greatly across countries and over time. The political factors that affect these flows are not well understood. Focusing on the relationship between trade and investment, we argue that international trade agreements—GATT/WTO and preferential trade agreements (PTAs)—provide mechanisms for making commitments to foreign investors about the treatment of their assets, thus reassuring investors and increasing investment. These international commitments are more credible than domestic policy choices, because reneging on them is more costly. Statistical analyses for 122 developing countries from 1970 to 2000 support this argument. Developing countries that belong to the WTO and participate in more PTAs experience greater FDI inflows than otherwise, controlling for many factors including domestic policy preferences and taking into account possible endogeneity. Joining international trade agreements allows developing countries to attract more FDI and thus increase economic growth. 相似文献
992.
A Bj?rneboe G E Bj?rneboe H Gjerde A Bugge C A Drevon J M?rland 《Forensic science international》1987,33(4):243-251
The National Institute of Forensic Toxicology, Oslo, receives blood and urine samples from all Norwegian drivers apprehended on suspicion of driving under the influence of alcohol or drugs. In 1983 we received samples from 1446 drug-suspected drivers, out of which 445 underwent toxicological analysis. The drugs found most frequently were tetrahydrocannabinol (THC) (n = 199), diazepam (n = 166) and amphetamine (n = 102). A cautious interpretation of the data indicate that about 200 of the 445 subjects selected for toxicological analysis drove under severe influence of drugs. Because of the high percentage of submitted cases not analysed for drugs, this figure represents a minimum estimate. Compared with the results from 1978, we found a several-fold increase in detections of THC and amphetamine in 1983. The number of diazepam detections did not increase in a similar way, but we estimated that the diazepam detections would have increased 3-fold if we had analysed as frequent for this drug in 1983 as in 1978. 相似文献
993.
994.
995.
996.
In cases of fragment/broken long bones, it becomes difficult to measure the length of bones for the purpose of calculation of total height (stature) of the individual with the help of magnification factors. An attempt has been made to devise a method of calculating the bones length from fragments on three long bones of the upper extremity. 相似文献
997.
S H Nelson V F Berger 《The Bulletin of the American Academy of Psychiatry and the Law》1988,16(1):67-75
The major current issues facing state and local forensic mental health programs are presented in this paper. Debates over forensic patients' rights and the insanity defense are discussed, together with many administrative problems such as the pros and cons of correctional versus mental health system program control and payment incentives for treatment. The authors cite the differing goals of correctional and mental health systems, i.e., security and treatment, as reasons for difficulties in developing needed collaboration. Guidelines are suggested to address such important issues as mixing civil with criminal patients, developing units for special populations, defining patients who can respond to treatment, and follow-up after discharge. 相似文献
998.
999.
1000.
In a typical year, the United States Employment Service places over 4 million persons from among 16 million applicants. This investigation of which applicants are most likely to be placed shows that placement occurs in two labor market segments, corresponding roughly to the primary and secondary labor markets described in the economic literature. The equity and efficiency implications o f devoting a substantial percentage o f Employment Service resources t o secondary labor market placements are considered. Several states currently use Employment Service data as a source of local labor market information. An argument is made that these states are misusing this data and suggestions for improvements are offered. 相似文献