Substantial requirements and conditions, terms of contract, standards and sub-contracting must be clear and definite.
其中实质性要求、条件、合同条款、标准和分包都必须清晰明确。
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。
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