综述了电石法生产聚氯乙烯过程中极易出现问题的几道工序，并列举了若干实例。
This paper Discusses some problems existing in procedures of PVC manufacture using calcium carbide as material and cites some examples.
简述核磁共振氢谱（ PMR）定量测法，并列举了一些应用实例。
This paper simply relates the quantitative analysis by PMR spectroscopy and enumerates some applied samples.
介绍了如何用地基系数法计算条形基础；列举了具体实例。
It is presented that how to calculate the strip footing with coefficient of ground and the specific examples are listed.
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