全文获取类型
收费全文 | 9199篇 |
免费 | 103篇 |
国内免费 | 6篇 |
专业分类
教育 | 6134篇 |
科学研究 | 1093篇 |
各国文化 | 322篇 |
体育 | 704篇 |
综合类 | 4篇 |
文化理论 | 62篇 |
信息传播 | 989篇 |
出版年
2021年 | 85篇 |
2020年 | 120篇 |
2019年 | 170篇 |
2018年 | 211篇 |
2017年 | 236篇 |
2016年 | 213篇 |
2015年 | 143篇 |
2014年 | 179篇 |
2013年 | 1599篇 |
2012年 | 189篇 |
2011年 | 189篇 |
2010年 | 169篇 |
2009年 | 171篇 |
2008年 | 227篇 |
2007年 | 209篇 |
2006年 | 176篇 |
2005年 | 164篇 |
2004年 | 179篇 |
2003年 | 121篇 |
2002年 | 111篇 |
2001年 | 153篇 |
2000年 | 180篇 |
1999年 | 157篇 |
1998年 | 86篇 |
1997年 | 84篇 |
1996年 | 74篇 |
1994年 | 67篇 |
1993年 | 81篇 |
1992年 | 137篇 |
1991年 | 147篇 |
1990年 | 148篇 |
1989年 | 155篇 |
1988年 | 120篇 |
1987年 | 117篇 |
1986年 | 116篇 |
1985年 | 156篇 |
1984年 | 126篇 |
1983年 | 118篇 |
1982年 | 99篇 |
1981年 | 80篇 |
1980年 | 90篇 |
1979年 | 141篇 |
1978年 | 88篇 |
1977年 | 90篇 |
1976年 | 78篇 |
1975年 | 76篇 |
1974年 | 88篇 |
1973年 | 80篇 |
1971年 | 74篇 |
1968年 | 74篇 |
排序方式: 共有9308条查询结果,搜索用时 15 毫秒
21.
Youth in grades 3, 6, 9, and 12 were interviewed about their beliefs regarding athletic excellence. A set of open-ended questions assessed beliefs about the source of athletic ability and the differences between excellent athletes and others. Respondents also rated excellent athletes on a checklist containing various physical, cognitive, emotional, and interpersonal traits. Younger children were less likely than adolescents to differentiate excellent athletes. All participants, but especially adolescents, attributed greater physical skills to highly competent athletes. All but the third graders thought excellent athletes were different from others in terms of cognitive skills (e.g., attention, concentration), and adolescents believed excellent athletes also differed from others in terms of attitudes (e.g., motivation, determination). Older males were more likely to believe that athletic excellence was due to natural ability, whereas older females were more likely to attribute excellence to early social support and facilitation. 相似文献
22.
23.
24.
T. Malati G. Rajani Kumari B. Yadagiri 《Indian journal of clinical biochemistry : IJCB》2001,16(2):224-233
Ovarian cancer is the fifth leading cause of death in women. The incidence of this malignancy increases in women over the
age of 40. The overall five years survival is less than 30%, as most women present with advanced stage disease. Until recently,
detection of early stage ovarian cancer has been difficult since it is usually nonpalpable and asymptomatic. The definitive
diagnosis of an ovarian mass is a common problem in gynecologic patients with adnexal mass. The routine standard evaluation
for adnexal masses includes patient's history, physical examination, ultrasound and histopathological examination. These parameters
individually or in combination have little predictive value. The accuracy of diagnostic tools are of immense value and great
concern to practicsing Gynecologists and Oncologists. The clinical application of serum concentration of CA 125, AFP and hCG
is of great help not only as diagnostic aid but also in monitoring efficacy of any treatment modality like chemotherapy, radiotherapy
or surgical resection. Additionally, evaluation of tumor marker concentration helps in predicting early biochemical recurrence
and in prognostication in different types of ovarian malignancies. The ability to differentiate a malignant mass from a benign
pelvic mass pretherapeutically could be enhanced optimally by additional use of tumor markers such as cancer antigen CA-125,
alphafetoprotein and human chorionic gonadotrophin in pre-and postmenopausal women. 相似文献
25.
26.
27.
28.
29.
30.