当隧道内粉尘浓度大于50mg/m3时,滤膜直径为（）,当粉尘浓度小于50m

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问题当隧道内粉尘浓度大于50mg/m3时,滤膜直径为（）,当粉尘浓度小于50mg/m3时,滤膜直径为（）。A.80mm,40mmB.75mm,35mmC.75mm,40mmD.80mm,35mm

选项 A.80mm,40mm
B.75mm,35mm
C.75mm,40mm
D.80mm,35mm

答案 C

解析滤膜直径为75mm,40mm,37mm规格。

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