Head structure defects of 7738 umbrella-type tower are presented after snow damage. Improvement methods are introduced and check-up calculation of load is made.
经过雪害教训后，提出了7738伞形铁塔头部结构存在的缺陷，介绍了改进的方法，并进行有关载荷的校验计算。
However, as the survey precision required improvement in the transient electromagnetic methods presented new research on technology issues.
但随着勘查精度要求的提高，对瞬变电磁方法技术的研究提出了新的课题。
The theories of compatibility of polymers, which consist of thermodynamics analysis, determination and improvement methods of compatibility etc. , are presented in this chapter.
介绍聚合物的相容性，包括热力学分析、 聚合物相容性的判断方法以及改善聚合物相容性的方法。
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