Both characteristic quantity of safety grade and its variable are the value obtained from the fuzzy sub-set of safety grade on domain, and are not a definite point.
安全等级特征量及安全等级变量，均为安全等级取值论域上的模糊子集，而并非是一个确定的点。
The relation between ratio of peaks and degree of defect is worked out, then a method of quantity analysis in frequency domain is proposed.
根据这一特征，得到小峰与大峰之比与缺陷程度之间的关系曲线，提出利用导纳曲线进行缺陷量化分析。
The control volume integral method is used for the differential equations and the integral conservation of each physical quantity is satisfied over the whole domain.
对微分方程采用控制体积积分方法，因而各物理量均满足守恒型的。
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