全文获取类型
收费全文 | 16891篇 |
免费 | 724篇 |
专业分类
各国政治 | 704篇 |
工人农民 | 581篇 |
世界政治 | 1152篇 |
外交国际关系 | 512篇 |
法律 | 11050篇 |
中国政治 | 98篇 |
政治理论 | 3399篇 |
综合类 | 119篇 |
出版年
2020年 | 237篇 |
2019年 | 302篇 |
2018年 | 357篇 |
2017年 | 405篇 |
2016年 | 411篇 |
2015年 | 339篇 |
2014年 | 348篇 |
2013年 | 1628篇 |
2012年 | 353篇 |
2011年 | 417篇 |
2010年 | 395篇 |
2009年 | 451篇 |
2008年 | 412篇 |
2007年 | 408篇 |
2006年 | 413篇 |
2005年 | 387篇 |
2004年 | 391篇 |
2003年 | 385篇 |
2002年 | 359篇 |
2001年 | 682篇 |
2000年 | 582篇 |
1999年 | 483篇 |
1998年 | 246篇 |
1997年 | 181篇 |
1996年 | 202篇 |
1995年 | 209篇 |
1994年 | 216篇 |
1993年 | 215篇 |
1992年 | 365篇 |
1991年 | 378篇 |
1990年 | 357篇 |
1989年 | 383篇 |
1988年 | 333篇 |
1987年 | 342篇 |
1986年 | 368篇 |
1985年 | 370篇 |
1984年 | 318篇 |
1983年 | 311篇 |
1982年 | 225篇 |
1981年 | 200篇 |
1980年 | 163篇 |
1979年 | 242篇 |
1978年 | 149篇 |
1977年 | 164篇 |
1976年 | 137篇 |
1975年 | 115篇 |
1974年 | 141篇 |
1973年 | 132篇 |
1972年 | 112篇 |
1971年 | 101篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
271.
272.
Ham Chande R 《Estudios demográficos y urbanos》1995,10(3):687-705, 741
"Social and economic indicators depict Mexico as a country of intermediate development. It is also in intermediate stages of demographic and epidemiologic transitions. When these traits are translated into socio-demographic perspectives, all projections indicate that for the next fifty years we can expect: (i) percentage decreases in child and teen-age populations, (ii) large percentage and absolute increases in adult population, and (iii) important increases in the elderly population.... Among elders death due to infectious diseases is less common than within other sectors of [the] population. Mortality associated with chronic ailments has increased, with recent and remarkable changes during the last twenty years. This transformation is not evenly distributed. It is more accelerated in developed and urban areas as contrasted with the rural and less developed." (SUMMARY IN ENG) 相似文献
273.
Zenteno Quintero RM 《Estudios demográficos y urbanos》1995,10(1):105-32, 236
"Tijuana has been the most extraordinary example of the modern demographic history of the [Mexican] northern border. This article is an essay on the economic, social, and demographic development of this important urban center during this century. Its purpose is two fold. On the one hand, to understand Tijuana's general population change in light of a unique socioeconomic development in the country, which has been characterized by a close dependence on the United States as well as by the creation of several federal programs aimed [at integrating] the natural economies. On the other hand, to introduce the discussion of the Mexico-United States border region to the non-specialist in this field." (SUMMARY IN ENG) 相似文献
274.
275.
276.
277.
Tort reform is controversial because of the need to balance cost considerations with the legitimate needs of plaintiffs who have suffered malpractice injury. In addition, proponents and opponents of the different proposals often formulate their positions based largely on anecdotal evidence and concerns of special interest groups rather than careful studies. As a result, it may be some time before malpractice reform is addressed comprehensively at the federal level, leaving the states to their own reform devices. 相似文献
278.
279.
280.