单选题在单凸轮换向的主机遥控系统中，把车钟手柄从倒车慢速扳到正车全速挡时，换向开始时刻为（）。A扳动车钟手柄时刻B车钟手柄过了停车位置时C车钟手柄扳到位时D主机转速下降到0时
单选题
在单凸轮换向的主机遥控系统中，把车钟手柄从倒车慢速扳到正车全速挡时，换向开始时刻为（）。
A
扳动车钟手柄时刻
B
车钟手柄过了停车位置时
C
车钟手柄扳到位时
D
主机转速下降到0时
参考解析
解析：
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