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某空气处理室设有两级过滤器,按质量的答案

某空气处理室设有两级过滤器,按质量浓度计,粗效过滤器的过滤效率为80%,中效过滤器的过滤效率为90%,则该空气处理室过滤器的总效率是(  )。

单选题
2021-07-17 22:26
A、85%
B、90%
C、95%
D、98%
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正确答案
A

试题解析

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