全文获取类型
收费全文 | 1451篇 |
免费 | 35篇 |
专业分类
各国政治 | 55篇 |
工人农民 | 61篇 |
世界政治 | 85篇 |
外交国际关系 | 39篇 |
法律 | 959篇 |
中国政治 | 23篇 |
政治理论 | 251篇 |
综合类 | 13篇 |
出版年
2023年 | 5篇 |
2022年 | 6篇 |
2021年 | 11篇 |
2020年 | 18篇 |
2019年 | 36篇 |
2018年 | 29篇 |
2017年 | 40篇 |
2016年 | 42篇 |
2015年 | 26篇 |
2014年 | 26篇 |
2013年 | 116篇 |
2012年 | 34篇 |
2011年 | 38篇 |
2010年 | 36篇 |
2009年 | 28篇 |
2008年 | 39篇 |
2007年 | 31篇 |
2006年 | 26篇 |
2005年 | 32篇 |
2004年 | 51篇 |
2003年 | 48篇 |
2002年 | 31篇 |
2001年 | 109篇 |
2000年 | 82篇 |
1999年 | 85篇 |
1998年 | 42篇 |
1997年 | 10篇 |
1996年 | 10篇 |
1995年 | 14篇 |
1994年 | 9篇 |
1993年 | 14篇 |
1992年 | 30篇 |
1991年 | 27篇 |
1990年 | 44篇 |
1989年 | 38篇 |
1988年 | 31篇 |
1987年 | 33篇 |
1986年 | 20篇 |
1985年 | 19篇 |
1984年 | 12篇 |
1983年 | 14篇 |
1982年 | 14篇 |
1981年 | 10篇 |
1980年 | 6篇 |
1979年 | 22篇 |
1978年 | 11篇 |
1971年 | 4篇 |
1970年 | 3篇 |
1969年 | 3篇 |
1968年 | 4篇 |
排序方式: 共有1486条查询结果,搜索用时 15 毫秒
231.
232.
X-chromosomal markers are particularly useful for solving complex problems relating to kinship and deficiency paternity analysis. In the present study, population genetics data of four X-chromosomal short tandem repeats (STRs) DXS8378, HPRTB, DXS7423 and DXS7132 were obtained by analyzing 500 unrelated Chinese individuals (250 males and 250 females). Population genetics data obtained from the Chinese were compared with those of the Asian and European population. Mutations in X-chromosomal markers were analyzed based on a total of 61 proven father-child and 45 proven mother-child pairs. 相似文献
233.
234.
The incidence of drug and chemical related deaths was studied over a six-year period in the State of Maryland. Deaths were classified into the following categories: alcohol, carbon monoxide (CO), single drugs, multiple drugs, and narcotism. The last three categories were further subdivided as to the specific drugs or chemicals involved. Over the six-year period the number of alcohol and CO deaths remained steady, the number of barbiturate and propoxyphene deaths declined, while the number of tricyclic antidepressant drug deaths increased. 相似文献
235.
This paper presents a study of the concepts of transferring computer technology among city governments. A sample of cities from a domestic population and an international population are used as the basis of the research. Contrary to expectation, and for both populations, the survey indicated the level of computer applications transfer among cities was found to be low compared to the amount of total application development. It was determined that an important source of transfer information was from “centers” such as the federal government, vendors, and transfer agencies, rather than city to city. International cities that were studied seem to experience a propensity toward centralized control at the national level. These controls often include the transfer of technical information. Further, the types of transfer may vary widely between the domestic vs the international cities. That is, domestic city transfers tend to be operations-oriented, while transfers from national centers tend to be management oriented. In general the study supported prior conclusions concerning the difficulties of transfer. The problem of mismatch and difficulties in modification make transfers very risky. Even so, there are many persons willing to take the risks in order to try to achieve lower costs and to realize the opportunity to obtain sophisticated applications. 相似文献
236.
Conclusion This paper has attempted to analyze the effect of the development of the financial sector, as reflected by the extent of financial
deepening, in the economic development of countries. The Theoretical framework integrating financial growth to real growth
is basically an adaptation of the Gurley-Shaw theory of finance in the development context, but with emphasis placed upon
the supply-leading role of the financial sector.
The empirical results of this study although not conclusive, indicate that financial deepening leads to a higher rate of capital
accumulation and a higher level of per capita income. The lack of definitiveness of our evidence in support of the financial
theory of economic development is due to a lack of comparable data on financial institutions, other than banks, for the different
countries. Thus, although our study lends support to the supply-leading thesis, further judgement of the thesis must await
more detailed empirical analyses. 相似文献
237.
K Yamamoto Y Yamamoto H Watanabe T Fujimiya M Okae K Ukita 《Zeitschrift für Rechtsmedizin》1989,102(6):415-419
A 35-year-old multipara died suddenly of a pulmonary embolism about 12 h after delivery. The morphological features and the entry site of the emboli into the circulation suggested that they were decidual cells. Intact decidual cells accounted for only a minority of the emboli: the great majority were cells that had lost their nuclei and/or had been fragmented. The presence of embolized areas, accompanied by fibroblasts and newly formed capillaries, suggested that the embolization process had started before the beginning of labor. However, no symptoms suggesting embolism had been recorded on the clinical chart. 相似文献
238.
An enzyme-linked immunosorbent assay (ELISA) has been developed for the detection of semen-specific 19-OH prostaglandin F1 alpha/F2 alpha (PGF). The assay can reliably and reproducibly detect as little as 2 pg 19-OH PGF/100 microliters and allows for the rapid analysis of large numbers of swab and stain extracts for the presence of semen. 相似文献
239.
An impact incurred by the movable head may bring about a change in intracranial pressure and this change may play an important part in the occurrence of the cerebral contusion. We have carried out the following experiments to determine whether the intracranial pressure change was attributed to an accelerated motion of the head or to a skull deformation. In the blow experiment in which the head was accelerated, a positive peak in the intracranial pressure was recorded immediately after impact at the impact site and a negative one at a site opposite the impact. In the one in which the skull could be deformed, the intracranial pressure curves at both sites contained harmonics. The modal analysis revealed an inbending in the frontal and occipital regions of the skull and an outbending in the parietal and temporal regions immediately after impact, followed by a reverse deformation. Regarding the intracranial pressure change, positive pressures were recorded in the frontal and occipital regions immediately after impact, followed by a negative one. This study demonstrated that the positive and negative peaks were caused by the accelerated motion of the head, and that the curve of the intracranial pressure changes contained harmonics which were caused by the deformation of the skull. 相似文献
240.
Joseph Y. S. Cheng 《Journal of Chinese Political Science》2012,17(2):165-185
As China??s comprehensive national power grows, its efforts to reduce the ??China threat?? perception have become more challenging. In line with the Chinese leadership??s current theme of peace and harmony in China??s foreign policy line, Chinese scholars have been highlighting the same theme in their research on China??s traditional strategic culture. Their research criticizes Western cosmopolitanism and praises the peaceful nature of China??s traditional ??tianxia?? concept. The exploitation of traditional strategic culture to provide re-assurance to the international community has now been raised to the official level, as reflected by the White Paper on ??China??s Peaceful Development?? released by the State Council??s Information Office on September 6, 2011. This probably means that it will be a major element of China??s public diplomacy for the foreseeable future. These efforts, however, may not have a significant impact because of rising nationalism in the region and the moderate escalation of existing territorial disputes involving China and its neighbors. 相似文献