单项选择题
铁路货车临修时,车轮踏面剥离长度:1处大于(),2处(每1处均)大于(),需更换轮对。
A.50mm,40mm
B.50mm,30mm
C.40mm,20mm
D.40mm,30mm
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单项选择题
A.50mm,40mm
B.50mm,30mm
C.40mm,20mm
D.40mm,30mm
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