全文获取类型
收费全文 | 1338034篇 |
免费 | 96057篇 |
国内免费 | 2913篇 |
专业分类
耳鼻咽喉 | 19744篇 |
儿科学 | 40301篇 |
妇产科学 | 38702篇 |
基础医学 | 187701篇 |
口腔科学 | 39893篇 |
临床医学 | 112838篇 |
内科学 | 263164篇 |
皮肤病学 | 30292篇 |
神经病学 | 106869篇 |
特种医学 | 53832篇 |
外国民族医学 | 435篇 |
外科学 | 208700篇 |
综合类 | 31053篇 |
现状与发展 | 6篇 |
一般理论 | 436篇 |
预防医学 | 92223篇 |
眼科学 | 31519篇 |
药学 | 100323篇 |
4篇 | |
中国医学 | 2994篇 |
肿瘤学 | 75975篇 |
出版年
2018年 | 11841篇 |
2015年 | 11964篇 |
2014年 | 16795篇 |
2013年 | 25365篇 |
2012年 | 33207篇 |
2011年 | 35103篇 |
2010年 | 20863篇 |
2009年 | 20330篇 |
2008年 | 33772篇 |
2007年 | 36880篇 |
2006年 | 37439篇 |
2005年 | 36170篇 |
2004年 | 35243篇 |
2003年 | 34202篇 |
2002年 | 33746篇 |
2001年 | 63698篇 |
2000年 | 65412篇 |
1999年 | 55473篇 |
1998年 | 14705篇 |
1997年 | 13494篇 |
1996年 | 12968篇 |
1995年 | 12256篇 |
1994年 | 11493篇 |
1992年 | 42828篇 |
1991年 | 41344篇 |
1990年 | 40600篇 |
1989年 | 39598篇 |
1988年 | 37018篇 |
1987年 | 36456篇 |
1986年 | 34943篇 |
1985年 | 33141篇 |
1984年 | 24850篇 |
1983年 | 21075篇 |
1982年 | 12688篇 |
1981年 | 11591篇 |
1980年 | 10785篇 |
1979年 | 23948篇 |
1978年 | 17085篇 |
1977年 | 14855篇 |
1976年 | 13401篇 |
1975年 | 15275篇 |
1974年 | 18092篇 |
1973年 | 17577篇 |
1972年 | 16821篇 |
1971年 | 15735篇 |
1970年 | 14930篇 |
1969年 | 14358篇 |
1968年 | 13470篇 |
1967年 | 12032篇 |
1966年 | 11275篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
41.
42.
43.
L.‐Q. Zheng X.‐C. Han Y. Huang H.‐W. Li X.‐D. Niu J. Li 《Clinical and experimental dermatology》2015,40(3):293-297
Porocarcinoma is an unusual, locally aggressive and potentially fatal neoplasm. Several cutaneous malignancies have been described in association with porocarcinoma, including squamous cell carcinoma, basal cell carcinoma and tricholemmal carcinoma. Previous reports have indicated that the occurrence of malignant tumours in combination with porocarcinoma is extremely rare, in particular with regard to Bowen disease (BD). We report an uncommon case of porocarcinoma occurring synchronously in a single BD lesion in a 63‐year‐old woman with multiple BD lesions. The clinical and histological findings confirmed this diagnosis. 相似文献
44.
Erin C. Tully Jackson M. Gray Sherryl H. Goodman Stephen Nowicki Jr. 《Early child development and care》2016,186(12):1939-1951
Children who expect they can bring about good outcomes and avoid bad outcomes tend to experience more personal successes. Little is known about factors that contribute to these ‘control expectancies’. The purpose of the present study was to determine whether children's internal control expectancies occur in the context of parents’ internal control expectancies, low family strain, and high family cohesiveness and whether these factors are more strongly related to daughters’ than sons’ control expectancies. A community sample of 85 children aged 9–11 years and their parents (85 mothers; 63 fathers) completed rating scales. Fathers’ more internal control expectancies and mothers’ reports of fewer family strains were associated with daughters’ but not sons’ greater internal control expectancies, and greater family cohesiveness was related to both daughters’ and sons’ internal control orientations. These findings suggest that family factors may contribute to children's, particularly daughters’, development of internal control expectancies. 相似文献
45.
46.
47.
48.
49.
Shingo Hashimoto Masaki Katsurada Rie Muramatsu Kumiko Asai Kenichiro Tanaka Kensuke Hayashi Yoshiaki Kibe Koichiro Nakajima Yukiko Hattori Hiromitsu Iwata Jun-etsu Mizoe Hiroyuki Ogino Yuta Shibamoto 《Practical radiation oncology》2019,9(2):e149-e155
Purpose
Suppression of respiratory movement of the liver would be desirable for high-precision radiation therapy for liver tumors. We aimed to investigate the effect of our original device-free compressed shell fixation method and breathing instruction on suppression of respiratory movement. The characteristics of liver motion based on the movement of a fiducial marker were also analyzed.Methods and Materials
First, respiratory amplitudes of the liver with the device-free compressed shell were analyzed from the data of 146 patients. The effect of this shell fixing method on liver movement was evaluated. Second, as another cohort study with 166 patients, interfractional internal motion of the liver for patients fixed in the shell was calculated using the fiducial marker coordinate data of images for position setting before daily irradiation. Third, in another 12 patients, intrafractional internal motion was calculated from the fiducial marker coordinate data using x-ray images before and after irradiation.Results
The median respiratory movement without the shell, after fixing with the shell, and after instructing on the breathing method with the shell was 14.2 (interquartile range, 10.7-19.8), 11.5 (8.6-17.5), and 10.4 mm (7.3-15.8), respectively. Systematic and random errors of interfractional internal motion were all ≤2 mm in the left-right and anteroposterior directions and 3.7 and 3.0 mm, respectively, in the craniocaudal direction. Systematic and random errors of intrafractional internal motion were all ≤1.3 mm in the left-right and anteroposterior directions and 0.8 and 2.4 mm, respectively, in the craniocaudal direction.Conclusions
The device-free compressed shell fixation method was effective in suppressing the respiratory movement of the liver. Irradiation position matching using the fiducial marker can correct the interfractional internal motion on each day, which would contribute to the reduction of the margin to be given around the target. 相似文献50.