全文获取类型
收费全文 | 4552篇 |
免费 | 160篇 |
专业分类
各国政治 | 161篇 |
工人农民 | 145篇 |
世界政治 | 302篇 |
外交国际关系 | 167篇 |
法律 | 3102篇 |
中国共产党 | 2篇 |
中国政治 | 46篇 |
政治理论 | 736篇 |
综合类 | 51篇 |
出版年
2022年 | 26篇 |
2021年 | 33篇 |
2020年 | 73篇 |
2019年 | 73篇 |
2018年 | 100篇 |
2017年 | 115篇 |
2016年 | 113篇 |
2015年 | 90篇 |
2014年 | 108篇 |
2013年 | 379篇 |
2012年 | 124篇 |
2011年 | 147篇 |
2010年 | 116篇 |
2009年 | 115篇 |
2008年 | 142篇 |
2007年 | 107篇 |
2006年 | 132篇 |
2005年 | 128篇 |
2004年 | 130篇 |
2003年 | 123篇 |
2002年 | 116篇 |
2001年 | 209篇 |
2000年 | 158篇 |
1999年 | 114篇 |
1998年 | 54篇 |
1997年 | 50篇 |
1996年 | 42篇 |
1995年 | 58篇 |
1994年 | 48篇 |
1993年 | 57篇 |
1992年 | 83篇 |
1991年 | 88篇 |
1990年 | 81篇 |
1989年 | 70篇 |
1988年 | 89篇 |
1987年 | 83篇 |
1986年 | 106篇 |
1985年 | 109篇 |
1984年 | 87篇 |
1983年 | 85篇 |
1982年 | 40篇 |
1981年 | 37篇 |
1979年 | 35篇 |
1978年 | 34篇 |
1975年 | 31篇 |
1974年 | 49篇 |
1972年 | 29篇 |
1971年 | 31篇 |
1970年 | 30篇 |
1968年 | 32篇 |
排序方式: 共有4712条查询结果,搜索用时 0 毫秒
51.
52.
53.
I N Perr 《The Bulletin of the American Academy of Psychiatry and the Law》1990,18(2):143-151
Some psychiatrists misuse theoretical concepts beyond their generally accepted dimensions in an attempt to support a conclusion favorable to a litigant or defendant. In the case presented, the concept of identification with the aggressor was used in an attempt to eliminate or minimize the effect of a confession and to buttress the claim that the confession itself was false. Quotations from the actual reports and testimony are used to reflect both this tactic and the context in which these issues were pursued, including a rather startling admission by the psychiatrist dealing with the thoroughness of his professional effort. A brief history of "identification with the aggressor" is presented, a history which contrasts with its application to rather routine police questioning. Similarly, skepticism is clearly merited when a psychitrist testifies as to truthfulness or falsity of a statement. 相似文献
54.
The authors developed a method of malathion insecticide determination in the cadaveric material (blood and wall of the stomach) including extraction of 5 ml of blood (5 g of fragmented tissue of stomach wall) by hexan; preparative chromatographic purification of extract on silicagel layer L 5/40 mkm in hexan-diethyl ether system 10:2; Gas-liquid chromatographic investigation on column with 5% SE-30 and 5% XE-60 (Chromatograph "Colour-106" with thermionic detector). This method makes it possible to detect 72-76% of malathion added. 相似文献
55.
56.
The authors reviewed at autopsy the causes of death of 274 patients with evidence of intravenous drug abuse who had been admitted to a large public hospital. There were 127 who died from diseases unrelated to intravenous drug abuse, and in 41% of these, chronic alcoholism was implicated. Deaths from overdose syndromes and drug-related organ pathology comprised only 11% of all cases. The mean age at death was 39 years. There was a male/female ratio of 3.6:1. Half of all patients died from infection--72 from acquired immunodeficiency syndrome (AIDS) alone. These findings indicate that persons hospitalized with a history of intravenous drug abuse usually die from causes other than overdose and that AIDS and chronic alcoholism are significant problems. Emphasis should be placed upon detecting "hidden" intravenous drug deaths to provide more accurate statistical information. 相似文献
57.
58.
Among the major transformations affecting Mexican women in recent decades were their growing participation in the labor market and the fertility decline that began in the 1970s with widespread access to contraception. Data from 3 major Mexican fertility surveys, employment surveys, and censuses are used to analyze changes in female employment and their determinants during the years of economic recession in the 1980s. The main characteristics of the Mexican fertility decline are described, and the relationship between fertility and female employment before and during the economic recession is scrutinized for different social sectors. Suggestions for research on the affects of these changes on the social condition of Mexican women are then presented. The proportions of Mexican women over 12 years old who declared themselves economically active increased from 16% in 1970 to 21% in 1979 and 32% in 1987. Until the 1970s the majority of employed women were young and single or childless. But a clear increase occurred between 1976-87 in the economic participation of older women in union. Economic participation of low income and less educated women increased as they sought work or created their own in response to deteriorating living conditions during the recession. Young women with intermediate or higher educational levels did not increase their relative presence in the labor market in the same period. The marked increase in economic participation of less educated women in union with small children was accompanied by a significant increase in manual occupations. Between 1982-87, the proportion of women aged 20-49 in nonsalaried manual occupations rose from 7.6% to 18.5%. Mexico's fertility decline has been well documented. The total fertility rate declined from 6.3 in 1973 to 3.8 in 1986, while the percentage of women in union using a contraceptive method increased from 30.2 in 1976 to 52.7 in 1987. Fertility differentials have been declining but are still considerable. The inhibitory influence of children on female labor force participation in Mexico is clear, but in the years of economic recession the most notable increase in female workers was in women with 3 or more children of whom the youngest was under 3. It appears that the influence of children on women's employment depends on the socioeconomic status of the woman as well as on the dynamism or sluggishness of the labor market. Research is needed on the significance of changes in fertility and female employment for women's status in Mexico. Several recent works have presented results of microsocial analyses of the ways in which women experience changes in their lives resulting from fertility and employment decisions. A methodological strategy for studying these changes and their influence on women's status should focus on comparisons between different generations and birth cohorts, different types of employment, and different socioeconomic statuses. Both macrosocial and microsocial forms of analysis are needed to provide a full picture. 相似文献
59.
60.