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【单选题】
粉尘对通风管道的磨损性与气流速度的( )次方成正比，气流速度越大，磨损程度越严重。A.
1~2
B.
2~3
C.
3~4
D.
4~5
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皮皮学刷刷变学霸
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A.
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B.
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D.
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B.
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C.
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D.
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A.
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B.
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A.
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B.
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C.
肠毒素B亚单位进入细胞
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E.
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