Uncertain time usually is fuzzy, this paper studies uncertain time order, expression method of uncertain time interval and tense relation by way of the fuzzy set.
不确定时间常常表现出模糊性，该文用模糊集的方法研究不确定时间点、不确定时间区间的表示方法及其时态关系。
An evaluation method fur failure sample set based on fuzzy grey relation analysis is proposed in order to obtain perfect failure sample set before testability demonstration experiment.
为了在测试性验证试验之前获得理想的故障样本集，提出了一种基于模糊灰色关联分析的故障样本评估方法。
This method can also carry on the comparison of the net benefit among different schemes, in order to confirm the cost of different schemes and benefit relation.
这个方法还可以在不同的方案之间进行净收益的比较，以确定不同方案的本钱和收益关系。
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