设净化系统如下图所示,对大于等于0.5 μm计数效率为 η1 = 20%,η2 = 40%,η2' = 30%,η3 = 99.999% ,则回风通路上过滤器的总效率为()。
A.0.999952
B.0.999958
C.0.9999958
D.0.99999
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正确答案: C 答案分析:无
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