单项选择题
A.0个B.2个C.4个D.6个
A.CRH380AB.CRH380BC.CRH5D.CRH2
A.5M3TB.4M4TC.6M2TD.1M7T
A.轴向弹簧B.垂向减振器C.空气弹簧D.抗侧滚扭杆
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