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In this article, the center conditions, isochronous center conditions and bifurcation of limit cycles at infinity for a class of fifth system are investigated.
中文意思:
摘要研究一类五次系统无穷远点的中心、拟等时中心条件与极限环分支问题。


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In this article, the author, in the light of documental data, combs out the national history and culture in Qinghai, and holds that the characteristics of national history and culture in Qinghai are distinctive and well worth discussing. 摘要本文借助史料对青海民族历史与文化作了梳理,认为青海民族历史与文化特点鲜明,很值得探究。
In this article, the authors analyze the situation of fiscal equalization after the reform of tax-sharing system in china. 摘要本文对实行分税制以来,我国财政均等化的现状和原因进行了实证分析。
In this article, the authors compare them in terms of the history, purposes, organization, financial resources, operations and lending process. 本文从历史沿革、宗旨、组织机构、资金来源、业务领域和贷款程序六个层面对二者进行了比较。
In this article, the authors reconstruct the shape of iron ore bodies and the metallotectonic model of Cihai iron or deposit. 笔者重新建立了磁海铁矿床的矿体模型和成矿演化构造模式。
In this article, the cause of oxygen corrosion occurred at the water inlet in the waste heat boiler without the mea-sure of removing oxygen and the problem of water shock were dis-cussed. 本文对没有除氧措施的余热锅炉气包进水管发生的氧腐蚀及由此产生的气包水冲击问题进行了探讨。
In this article, the center conditions, isochronous center conditions and bifurcation of limit cycles at infinity for a class of fifth system are investigated. 摘要研究一类五次系统无穷远点的中心、拟等时中心条件与极限环分支问题。
In this article, the current status of epithermal neutron beams in the world is reviewed and also the design and construction plan of the epithermal neutron beam at the Tsing Hua Open-pool Reactor is reported. 本文将介绍世界各国在设计建造超热中子照射管之现况,以及目前在国内清华水池式反应器建造超热中子照射管之进展及计划。
In this article, the development of the study on synthesis, solution properties and the application of novel amphiphilic polymers are summarized, as well as the trends of the study on amphiphilic polymers. 本文从新型两亲性高聚物的制备、两亲性高聚物的溶液性质、两亲性高聚物的应用三方面简要综述了两亲性高聚物的研究现状和未来发展趋势。
In this article, the dissoluble lead in the 2B pencil's interior was determined by spectrophotometry. 本文采用可见分光光度法测定了铅笔内芯中可溶性铅的含量。
In this article, the effects and characteristics of the corrugated tubes used in ammonia and methanol condensers were introduced. The reliability of the corrugated tubes, then, was analyzed. 介绍了波纹管在氨、甲醇冷凝器中的应用效果及特点,对波纹管在氨、甲醇冷凝器中的使用可靠性进行了分析。
In this article, the existing questions of university mental health education in China are analyzed: goal is not clear; specialized level is low; method and technique are simple; fundamental research is relative laggard. 摘要本文着重分析了当前我国高校心理健康教育发展过程中存在的问题:目标认识模糊;专业化程度偏低;方法、技术简单化;理论研究相对滞后。
 
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