单项选择题
A.主弹簧太松 B.杠杆与电磁铁油缸盖相碰 C.制动器选型不合适 D.制动闸瓦沾有油污
A.5% B.10% C.15% D.20%
A.45% B.50% C.55% D.60%
A.70% B.75% C.80% D.85%
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