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Trace elements and its study progress in sports firld

微量元素及其在体育领域中的研究进展

Study on calculation and distribution characteristic of vertical permeability coefficient within conduction-convection temperature firld in fissured rock zone

裂隙岩体地区导热–对流型温度场垂向渗透系数的计算及分布特征研究

reform track and firld competition system ;

改革田径竞赛制度；

The increasing of dogmatism and bookishness as well as the overflow of various unhealthy tendencies in the research firld has damaged the academic reputation .

教条主义、本本主义的繁衍，研究领域各种不正之风的泛滥，极大地损害了学术的声誉。

In the drilling technology of 10 deep exploratory wells drilled over 5000m in northwest sichuan oil firld , this paper analyses geologic problems , casing programs , usage of drilling fluid , cementing design and operation etc. on super-deep well drilling , and proposes special approaches and strategy of improving super-deep well drilling technique level .

针对川西北矿区已完成的13口5000m以上的深探井钻井工艺，分析了超深井钻井面临的地质问题、井深结构、套管程序、钻井液使用和固井设计与施工等情况，提出了提高超深井钻井技术水平的途径和对策。