全文获取类型
收费全文 | 188559篇 |
免费 | 1566篇 |
国内免费 | 100篇 |
专业分类
耳鼻咽喉 | 1281篇 |
儿科学 | 6874篇 |
妇产科学 | 3242篇 |
基础医学 | 18172篇 |
口腔科学 | 1885篇 |
临床医学 | 13199篇 |
内科学 | 34450篇 |
皮肤病学 | 987篇 |
神经病学 | 17445篇 |
特种医学 | 9444篇 |
外国民族医学 | 2篇 |
外科学 | 30899篇 |
综合类 | 2372篇 |
预防医学 | 18481篇 |
眼科学 | 2951篇 |
药学 | 10254篇 |
中国医学 | 646篇 |
肿瘤学 | 17641篇 |
出版年
2023年 | 86篇 |
2022年 | 163篇 |
2021年 | 252篇 |
2020年 | 138篇 |
2019年 | 190篇 |
2018年 | 22116篇 |
2017年 | 17505篇 |
2016年 | 19681篇 |
2015年 | 1158篇 |
2014年 | 1093篇 |
2013年 | 1180篇 |
2012年 | 7505篇 |
2011年 | 21555篇 |
2010年 | 19128篇 |
2009年 | 11793篇 |
2008年 | 20025篇 |
2007年 | 22268篇 |
2006年 | 1181篇 |
2005年 | 2817篇 |
2004年 | 4019篇 |
2003年 | 4934篇 |
2002年 | 3140篇 |
2001年 | 686篇 |
2000年 | 803篇 |
1999年 | 600篇 |
1998年 | 404篇 |
1997年 | 394篇 |
1996年 | 240篇 |
1995年 | 261篇 |
1994年 | 236篇 |
1993年 | 180篇 |
1992年 | 398篇 |
1991年 | 398篇 |
1990年 | 422篇 |
1989年 | 404篇 |
1988年 | 316篇 |
1987年 | 292篇 |
1986年 | 260篇 |
1985年 | 222篇 |
1984年 | 168篇 |
1983年 | 126篇 |
1982年 | 89篇 |
1981年 | 66篇 |
1980年 | 97篇 |
1979年 | 91篇 |
1978年 | 77篇 |
1975年 | 71篇 |
1974年 | 89篇 |
1973年 | 76篇 |
1969年 | 70篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
Clinical applications of active anterior rhinomanometry of the oscillation type had been carried out for the purposes other than the conventional uses of rhinomanometry. 1. Effect of acupuncture upon the nasal resistance to airflow: Among 8 acupuncture points which were recorded in Chinese traditional medical literatures as effective for improving nasal breathing, Ingxiang point had been proved to possess definite effect of lowering the nasal resistance to air-flow in patients with congestion of nasal mucosa, whereas in other acupuncture points this effect was not certain. 2. The severity of snoring before and after treatment could be determined objectively by the measurement of nasal resistance to air-flow and the breathing pattern of the patient. 相似文献
32.
33.
To clarify when and how rapidly individual muscles are damaged in the course of Duchenne muscular dystrophy (DMD), we followed X-ray CT of whole body skeletal muscles from 29 cases of DMD patients (age ranging 3 to 23 years) for a period of 2 to 6 years. Each patient had 2 to 5 scans with an average of 3.3. We evaluated chronological changes of 23 muscles from the entire body using the muscle damage stage defined as follows. The stages were classified into the following 5 stages: stage 0; normal, 1; area of fatty replacement less than 10% of whole muscle area, 2; area of fatty replacement between 10 to 50%, 3; area of fatty replacement 50 to 90%, 4; almost complete fatty replacement. Each muscle had its own period of rapid degeneration starting at 5 to 10 years of age and, continuing 5 to 10 years. In some muscles such as gluteus maximus or quadriceps femoris, fatty replacement started at 5 years or earlier and progressed for five years, while other muscles such as splenius capitis, damage started much later, e.g. around 10 years of age and the progression was much slower. There was a variation of at least 5 years among individual patients in any muscle damage stage, reflecting the variability of clinical severity in each patient. On the basis of the above results we defined the whole body muscle damage index as a summation of the muscle damage stages of the following five muscles: gluteus maximus, quadriceps femoris, gracilis, medial head of gastrocnemius and splenius capitis.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
34.
S Watanabe K Nakano H Misumi M Yoshikai M Endo A Hashimoto H Koyanagi 《Nihon Geka Gakkai zasshi》1989,90(9):1513-1516
St. Jude Medical valve replacement was performed in 1,039 patients; 320 had aortic (AVR), 543 mitral (MVR), and 176 had double valve replacement (DVR). There were 44(4.2%) early deaths. Follow-up extended in 995 patients from 10 to 130 months, with a cumulative period of 2,730 patients-years. The overall survival rates of AVR, MVR, and DVR patients at 10 years were 60.5%, 89.6%, 90.3% respectively. The linearized incidences of valve thrombosis, thromboembolism, anticoagulation-related hemorrhage, prosthetic valve endocarditis, and significant hemolysis were as follows: 0.11%/pt-yr, 1.33%/pt-yr, 0.04%/pt-yr, 0.18%/pt-yr, and 0.11%/pt-yr, respectively. There were no structural failure after 10 years follow-up. Reoperation (explant and re-replacement or suture repair) was required in 10 patients. Seven of them had periprosthetic leakage, 2 had valve thrombosis, and one underwent reoperation because of a technical error. Actuarially over 98% of patients were free of valve-related mortality at 10 years. St. Jude Medical valve is an excellent alternative for use in the surgical treatment of valvular heart disease. 相似文献
35.
36.
37.
38.
Chad G. Ball Andrew W. Kirkpatrick Matthew Smith Robert H. Mulloy Leonard Tse Ian B. Anderson 《European journal of trauma and emergency surgery》2007,33(5):550-552
Abstract We report a case of SMV injury in a critically ill patient. The patient was a 19-year-old woman involved in a motor vehicle
collision. Her injuries included grade II splenic and renal lacerations, devascularized and lacerated right and transverse
colon, a transected transverse mesocolon, a massive shear injury of her abdominal wall, and two partial SMV transections.
At initial damage control laparotomy, the SMV was ligated, the devascularized bowel resected and a temporary abdominal closure
applied. At re-operation, a mesocaval shunt using saphenous vein was employed. The shunt failed and the patient required a
saphenous vein jump graft. Although visceral vascular injuries are rare, ligation of the SMV in a damage control situation
is acceptable. This case study is the first to discuss appropriate treatment when interruption to a patient's collateral visceral
venous drainage limits the surgeon’s ability to ligate. In these situations, bypass shunts may be successful. 相似文献
39.
Henry Cisneros 《AIDS and behavior》2007,11(2):7-8
For persons battling HIV/AIDS a stable place to live may decide the length and quality of life itself. It is nearly impossible for a person on the streets to engage in a needed continuous AIDS treatment regimen when the very basic question of where that person will rest his or her head when darkness comes in just a few hours is unresolved. When danger lurks on the streets, when cold numbs the limbs, when tiredness overwhelms the mind, when fear breaks the spirit, a place to call home would make all the difference. 相似文献
40.