空气动力直径小于( )μm的极细微粉尘,是引起尘肺病的主要粉尘。A:2B:5C:7D:10

作者: rantiku 人气: - 评论: 0
问题 空气动力直径小于( )μm的极细微粉尘,是引起尘肺病的主要粉尘。
选项 A:2 B:5 C:7 D:10
答案 B
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