全文获取类型
收费全文 | 42964篇 |
免费 | 3080篇 |
国内免费 | 148篇 |
专业分类
耳鼻咽喉 | 464篇 |
儿科学 | 1378篇 |
妇产科学 | 1175篇 |
基础医学 | 5926篇 |
口腔科学 | 494篇 |
临床医学 | 6271篇 |
内科学 | 8244篇 |
皮肤病学 | 712篇 |
神经病学 | 4366篇 |
特种医学 | 810篇 |
外国民族医学 | 1篇 |
外科学 | 3457篇 |
综合类 | 763篇 |
一般理论 | 42篇 |
预防医学 | 5012篇 |
眼科学 | 882篇 |
药学 | 3005篇 |
中国医学 | 81篇 |
肿瘤学 | 3109篇 |
出版年
2023年 | 223篇 |
2022年 | 471篇 |
2021年 | 865篇 |
2020年 | 479篇 |
2019年 | 799篇 |
2018年 | 931篇 |
2017年 | 721篇 |
2016年 | 806篇 |
2015年 | 975篇 |
2014年 | 1309篇 |
2013年 | 1992篇 |
2012年 | 3012篇 |
2011年 | 3166篇 |
2010年 | 1603篇 |
2009年 | 1556篇 |
2008年 | 2845篇 |
2007年 | 3074篇 |
2006年 | 3146篇 |
2005年 | 3102篇 |
2004年 | 3012篇 |
2003年 | 2827篇 |
2002年 | 2616篇 |
2001年 | 372篇 |
2000年 | 270篇 |
1999年 | 376篇 |
1998年 | 483篇 |
1997年 | 417篇 |
1996年 | 379篇 |
1995年 | 362篇 |
1994年 | 268篇 |
1993年 | 297篇 |
1992年 | 209篇 |
1991年 | 207篇 |
1990年 | 188篇 |
1989年 | 181篇 |
1988年 | 193篇 |
1987年 | 152篇 |
1986年 | 132篇 |
1985年 | 151篇 |
1984年 | 190篇 |
1983年 | 185篇 |
1982年 | 237篇 |
1981年 | 176篇 |
1980年 | 184篇 |
1979年 | 110篇 |
1978年 | 107篇 |
1977年 | 112篇 |
1976年 | 86篇 |
1975年 | 73篇 |
1974年 | 79篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
Few studies have examined the effects of parental incarceration (PI) on outcomes above and beyond other risk and adverse childhood experiences (ACEs). The objectives of this study were to (1) the associations between PI and mental health problems (attention, externalizing, internalizing, and total behavioral problems) and (2) the mediating role of current socioeconomic status and cumulative ACEs. An observational and cross-sectional design was employed. Analyses included hierarchical multivariable linear regression modeling. The analytic sample included 613 adolescents (11–17?years). On average, youth exposed to PI experienced three times as many ACEs compared with youth unexposed. Youth exposed to PI were more likely to have behavioral problems than their unexposed peers. The main effect for all models was attenuated by current economic hardship as well as exposure to increasing numbers of ACEs. Exposure to PI can be viewed as a marker of accumulative risk for intervention since youth impacted by PI are more likely to experience behavioral difficulties and associated adverse childhood experiences. Due to the associated adversity that impact youth exposed to PI, mental health providers need to be able to identify and screen for symptoms associated with trauma. 相似文献
5.
6.
Judith Brock Andreas Schmid Thomas Karrasch Petra Pfefferle Jutta Schlegel Inga Busse Annette Hauenschild Barbara Schmidt Maria Koukou Efthymia Arapogianni Andreas Schultz Miriam Thomalla Secil Akinci Johannes Kruse Winfried Padberg Andreas Schffler Jens Albrecht 《Clinical endocrinology》2019,91(3):400-410
7.
8.
9.
10.
Elizabeth A. Mosley PhD MPH Amy J. Schulz PhD MPH MSW Lisa H. Harris MD PhD Barbara A. Anderson PhD 《Women & health》2020,60(7):806-820
ABSTRACT Abortion is legal in South Africa, but negative abortion attitudes remain common and are poorly understood. We used nationally representative South African Social Attitudes Survey data to analyze abortion attitudes in the case of fetal anomaly and in the case of poverty from 2007 to 2016 (n = 20,711; ages = 16+). We measured correlations between abortion attitudes and these important predictors: religiosity, attitudes about premarital sex, attitudes about preferential hiring and promotion of women, and attitudes toward family gender roles. Abortion acceptability for poverty increased over time (b = 0.05, p < .001), but not for fetal anomaly (b = ?0.008, p = .284). Highly religious South Africans reported lower abortion acceptability in both cases (Odds Ratio (OR)anomaly = 0.85, p = .015; ORpoverty = 0.84, p = .02). Premarital sex acceptability strongly and positively predicted abortion acceptability (ORanomaly = 2.63, p < .001; ORpoverty = 2.46, p < .001). Attitudes about preferential hiring and promotion of women were not associated with abortion attitudes, but favorable attitudes about working mothers were positively associated with abortion acceptability for fetal anomaly ((ORanomaly = 1.09, p = .01; ORpoverty = 1.02, p = .641)). Results suggest negative abortion attitudes remain common in South Africa and are closely tied to religiosity, traditional ideologies about sexuality, and gender role expectations about motherhood. 相似文献