全文获取类型
收费全文 | 3802篇 |
免费 | 8篇 |
国内免费 | 7篇 |
专业分类
各国政治 | 134篇 |
工人农民 | 82篇 |
世界政治 | 68篇 |
外交国际关系 | 92篇 |
法律 | 1778篇 |
中国共产党 | 97篇 |
中国政治 | 995篇 |
政治理论 | 111篇 |
综合类 | 460篇 |
出版年
2021年 | 3篇 |
2020年 | 4篇 |
2019年 | 6篇 |
2018年 | 13篇 |
2017年 | 7篇 |
2016年 | 8篇 |
2015年 | 12篇 |
2014年 | 19篇 |
2013年 | 147篇 |
2012年 | 219篇 |
2011年 | 594篇 |
2010年 | 363篇 |
2009年 | 302篇 |
2008年 | 327篇 |
2007年 | 230篇 |
2006年 | 242篇 |
2005年 | 176篇 |
2004年 | 220篇 |
2003年 | 166篇 |
2002年 | 140篇 |
2001年 | 101篇 |
2000年 | 83篇 |
1999年 | 65篇 |
1998年 | 9篇 |
1997年 | 21篇 |
1996年 | 7篇 |
1995年 | 10篇 |
1994年 | 25篇 |
1993年 | 22篇 |
1992年 | 24篇 |
1991年 | 27篇 |
1990年 | 19篇 |
1989年 | 30篇 |
1988年 | 27篇 |
1987年 | 31篇 |
1986年 | 26篇 |
1985年 | 11篇 |
1984年 | 13篇 |
1983年 | 4篇 |
1982年 | 5篇 |
1981年 | 12篇 |
1980年 | 5篇 |
1979年 | 5篇 |
1978年 | 4篇 |
1977年 | 4篇 |
1976年 | 6篇 |
1975年 | 3篇 |
1973年 | 5篇 |
1972年 | 3篇 |
1966年 | 2篇 |
排序方式: 共有3817条查询结果,搜索用时 250 毫秒
91.
云南省11个民族腺苷脱氨酶(ADA)频率的分布调查 总被引:1,自引:0,他引:1
采用电泳技术对云南省汉、彝、自、傣、哈尼、瑶、布朗、基诺、拉祜、佤及苦聪等11个民族的ADA 进行了表型分布调查。并对-20℃、4℃、室温(20℃左右)保存的血痕ADA 活性进行了测定。在汉族人群中发现了一例ADA4-1稀有型,家系调查表明其是由父亲遗传下来的。 相似文献
92.
Dean McSweeney 《政治学》1994,14(1):21-26
This article explains the failure of the Republican party to reproduce their dominance of the South in presidential elections at lower electoral levels. First, the foreign policy and social issues that have benefitted Republican presidential candidates have lower salience in state and congressional elections. Second, sustained Republican control of the White House has exposed the party to recurrent mid-term setbacks at lower electoral levels. Third, deficiencies of local party organization and a paucity of identifiers deprives the Republicans of candidates in sufficient quantity and quality to be competitive with Democrats. 相似文献
93.
过敏性休克死亡机体内白三烯变化的研究 总被引:5,自引:3,他引:5
本研究采用反相洗脱高效液相色谱(HPLC)法检测青霉素和血清过敏休克致死机体中自三烯(Leukotrienes,LTs)。(1)过敏休克前血中未检出LTs的任一组分,休克死亡后检出LTB_4和LTD_4。青霉素过敏血中LTB_4含量是10.10±4.76(ng/ml),LTD_4是26.75±6.55(ng/ml),未检出LTC_4和LTF_4。(2)正常动物肺,脾和肾中均未检出LTs。过敏休克的肺,脾和肾中不仅检出LTB_4和LTD_4,而且在不同脏器中呈规律分布。青霉素过敏肺中LTs_4是23.75±3.80(ng/g),LTD4是58.58±11.39(ng/g))未检出LTC_4和LTE_4。脾中仅有LTB_424.36±3.62(ng/g)。肾中仅有LTD_12.17±2.55(ng/g)。(3)过敏休克致死机体置室温6或12h,或置冰箱48h再测LTs,未见明显变化。(4)青霉素和血清诱发的过敏休克中,LTs的增加和分布是一致的。本研究提示:LTs含量和分布的变化是过敏性休克所共有,可为过敏性休克急死的法医学死因检定提供有价值的证据。 相似文献
94.
95.
Peter N. Dean 《公共行政管理与发展》1986,6(3):267-286
This paper reviews the evolution of programme and performance budgeting (PPB) in Malaysia from its beginning in 1969, through the in-depth implementation phase which began in 1972, to the present day. It outlines the system in the Ministry of Health, where PPB has been extensively developed and comments on the systems established in other in-depth ministries, in several of which little appears to have been achieved. In 1981 all other agencies were asked to adopt PPB in their budget submissions. Compliance has been superficial. The paper explores the constraints to the further development of PPB. These range from difficulties of securing appropriate staff, lack of top-level commitment and information problems, to the inherent difficulties of programming and performance measurement. In seeking to evaluate the success of PPB the paper adopts two approaches. The first, involving a small questionnaire survey amongst those involved in PPB, reveals rather guarded opinions concerning its usefulness and progress. The second, which explores the use made of PPB, reveals little use by legislators, budget officers or line managers, and no link between PPB and the planning process. However the audit department expresses considerable interest in relation to performance auditing. In summary the achievements of PPB have been modest. 相似文献
96.
97.
98.
99.
A 2-month-old infant girl died suddenly as a result of torsion of the uterine adnexa. The infant was found unresponsive in bed and was pronounced dead shortly after her arrival at a hospital. There were no antecedent signs of illness. At autopsy, the right ovary and right fallopian tube were twisted and were dark purple, swollen, and necrotic. The right ovary was enlarged by a follicle cyst 4 cm in diameter, which likely precipitated the torsion. The mechanism of death was unclear but may have resulted from the release of cytokines produced in response to necrotic adnexal tissue. Fatal uterine adnexal torsion has been reported rarely in infants; in all those cases there were antecedent symptoms. Torsion of the uterine adnexa should be included in the differential diagnosis of sudden death in infancy. 相似文献
100.
The Food and Drug Administration (FDA) is announcing that it has issued an order in the form of a letter to Ethicon, Inc., reclassifying the absorbable polydioxanone surgical (PDS) suture intended for use in soft tissue approximation, including use in pediatric cardiovascular tissue where growth is expected to occur and ophthalmic surgery, from class III (premarket approval) to class II (special controls). Elsewhere in this issue of the Federal Register, FDA is announcing the availability of the guidance document entitled "Class II Special Controls Guidance Document: Surgical Sutures; Guidance for Industry and FDA," which is immediately in effect as the special control for the PDS suture, but remains subject to public comment and possible future revision under the agency's good guidance practices. The agency is reclassifying this device into class II because new information supplied by the petitioner indicates that special controls, in addition to general controls, will provide reasonable assurance of the safety and effectiveness of the device, and there is sufficient information to establish special controls. Accordingly, the order is being codified in the Code of Federal Regulations. Any firm submitting a premarket notification (510(k)) for a new PDS suture will need to address the issues covered in the special control guidance. However, the firm need only show that its device meets the recommendations of the guidance or in some other way provides equivalent assurances of safety and effectiveness. 相似文献