题目内容

三个可靠度分别为0.7、0.8、0.9的部件R1、R2、R3并联构成一个系统，如图8-1所示。
图8-1 该系统的可靠度为(6)。

A. 0.9
B. 0.92
C. 0.991
D. 0.994

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