全文获取类型
收费全文 | 71229篇 |
免费 | 3358篇 |
专业分类
各国政治 | 4843篇 |
工人农民 | 2924篇 |
世界政治 | 6418篇 |
外交国际关系 | 4020篇 |
法律 | 32808篇 |
中国共产党 | 11篇 |
中国政治 | 1026篇 |
政治理论 | 21551篇 |
综合类 | 986篇 |
出版年
2021年 | 411篇 |
2020年 | 1200篇 |
2019年 | 1551篇 |
2018年 | 1751篇 |
2017年 | 2025篇 |
2016年 | 2252篇 |
2015年 | 1876篇 |
2014年 | 2154篇 |
2013年 | 11119篇 |
2012年 | 1774篇 |
2011年 | 1899篇 |
2010年 | 1934篇 |
2009年 | 2159篇 |
2008年 | 1916篇 |
2007年 | 1894篇 |
2006年 | 1988篇 |
2005年 | 1883篇 |
2004年 | 1801篇 |
2003年 | 1599篇 |
2002年 | 1613篇 |
2001年 | 1602篇 |
2000年 | 1427篇 |
1999年 | 1280篇 |
1998年 | 1185篇 |
1997年 | 1032篇 |
1996年 | 1015篇 |
1995年 | 955篇 |
1994年 | 944篇 |
1993年 | 977篇 |
1992年 | 969篇 |
1991年 | 1004篇 |
1990年 | 939篇 |
1989年 | 967篇 |
1988年 | 970篇 |
1987年 | 1008篇 |
1986年 | 975篇 |
1985年 | 1036篇 |
1984年 | 933篇 |
1983年 | 987篇 |
1982年 | 898篇 |
1981年 | 845篇 |
1980年 | 665篇 |
1979年 | 690篇 |
1978年 | 607篇 |
1977年 | 537篇 |
1976年 | 494篇 |
1975年 | 409篇 |
1974年 | 408篇 |
1973年 | 419篇 |
1972年 | 366篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
81.
骆仲达 《安徽中医药大学学报》2002,(6):27-29
目的:揭示电针治疗在缺血性脑血管疾病中的分子机制。方法:采用原位标记法,研究电针督脉的大椎、百会经穴对缺血性脑损伤的保护作用。凝闭大鼠大脑中动脉致局灶性脑缺血10h后,选择末端脱氧核苷酸转移酶介导dUTP缺口末端标记法(TUNEL)检测神经细胞的凋亡状况,并观察电针对其影响。结果:电针组大脑皮质梗死区内TUNEL染色阳性细胞显减少,与模型组比较,差异有显性意义(P<0.01)。结论:电针可抑制脑缺血后脑内神经细胞凋亡。 相似文献
82.
This paper investigates whether an Okun-type relationship between output and unemployment is taking hold in formerly planned economies as they move towards the market. Using a first-differences variant of Okun's Law, we test for its presence in 25 transition countries divided into groups of ``reform leaders'' and ``reform laggards.'' For leaders, represented by the 10 European Union (EU) accession countries, Okun's Law is detected in both 1991–94 and 1995–2000 periods. For laggards, represented by the remaining group, it is present only for the later period and only when countries affected by wars are removed from the sample. A comparison of unemployment–output elasticities and unemployment levels in EU candidates and EU members themselves indicates that their labor markets might be converging. 相似文献
83.
84.
85.
86.
Empirical findings indicate that many adult sexual offenders experienced sexual abuse during childhood. It has been suggested that characteristics of offenders' sexual perpetrating behaviors may resemble their own victimization experiences, although there has been minimal empirical investigation in this area. The purpose of the present study was to provide preliminary data on the relationship between childhood sexual abuse and characteristics of sexual offending behavior. A sample of adult male sexual offenders with histories of sexual abuse completed the Sexual Victimization Survey as well as a measure on their sexual offenses. Such characteristics as the nature of sexual activities, duration and frequency of experiences, and age and relationship of participants were examined. Results showed trends in the hypothesized direction and revealed a variety of similarities between childhood sexual abuse and adult sexual perpetration. Findings of this exploratory study suggest the importance of addressing the nature of victimization in the treatment of sexually abused boys and offenders with histories of sexual abuse. 相似文献
87.
88.
89.
90.