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【单选题】
某高可靠性计算机系统由下图所示的冗余部件构成。若每个部件的千小时可靠度 R均为0.9，则该计算机系统的千小时可靠度为(18)；该计算机系统的失效率丸可使用(19)来计算。注：t表示时间。
A.
0.656
B.
0.729
C.
0.801
D.
0.864
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