单项选择题
A.45% B.50% C.55% D.60%
A.70% B.75% C.80% D.85%
A.1/4 B.1/3 C.1/2 D.1/5
A.制动力矩逐渐减小 B.制动器突然失灵 C.制动轮温度过高、制动带冒烟 D.制动器打不开
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