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[单选题]
某系统由4个子系统并联组成，若该系统的可靠度为0.999，且每个子系统的可靠度相等，则该子系统的可靠度为（）。
A
a0.8b0.9c0.2d0.1
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试题答案：
B
答案解释：
1-(1-R4)=0.999可以算出R=0.9997，要求考生知道串联系统、并联系统的可靠度的计算。
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