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 relation between ratio of peaks and degree of defect is worked out, then a method of quantity analysis in frequency domain is .
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。
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