单项选择题
A.54mm B.64mm C.75mm D.85mm
A.220mm B.240mm C.260mm D.280mm
A.刚性轴悬式电机悬挂 B.弹性轴悬式电机悬挂 C.架悬式电机悬挂 D.牵引电动机体悬挂
A.≥1mm B.≥2mm C.≥3mm D.≥4mm
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