单项选择题
A.1/10 B.1/20 C.1/30 D.1/50
A.86kN B.186kN C.286kN D.386kN
A.空心轴 B.实心轴 C.单轴 D.双轴
A.15850mm B.15870mm C.15890mm D.15900mm
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