【单选题】
12V240ZJ6柴油机的启动发火转速是___。
A. 50～80r/min
B. 60～100r/min
C. 80～120r/min
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答案
C
解析
暂无解析
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JZ -7型空气制动机自阀放风阀的功用是:自阀手柄在___时，自阀的放风阀凸轮推开放风阀，直接排出制动管内的压力空气，以达到紧急制动的目的。
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