Amarts have very good properties. This paper gave the four equivalent propositions of R-Value's amart and their proofs by utilizing the theory of stopping time.

渐近鞅型序列具有很好的性质，本文给出实值渐近鞅的四个等价命题，并应用停时理论对它们予以证明。

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Results The average equivalent sound level and the detectable rate of workers hearing loss were exponential positive correlation, the coefficient of correlation r was 0 812 45.

结果听损检出率随平均等效声级的增加而呈明显的增加趋势，平均等效声级与噪声作业人员的听损检出率呈密切的指数正相关关系（相关系数r为0 812 45 ）。

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For a ring R, the following statements are equivalent:(1)R is left coherent;

证明了对于一个环R，下列条件等价：（1）R是左凝聚的；

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For a ring R, the following statements are equivalent:(1)R is left coherent;

证明了对于一个环R，下列条件等价：（1）R是左凝聚的；

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