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呼吸性粉尘是指粒径在_______微米以下，能被人体肺泡吸入的粉尘。
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呼吸性粉尘是指粒径在_______微米以下，能被人体肺泡吸入的粉尘。
A、20
B、10
C、5-7
时间：2021-09-01 22:49
关键词：
联大
河南理工大学
矿井通风与安全课程设计
答案解析
C
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