问题
单项选择题
牵引电机小齿轮“弛缓”保护,是当防空转装置动作()后,仍不起作用时,才起保护作用。
A、0.5s
B、1s
C、1.5s
D、2s
答案
参考答案:B
牵引电机小齿轮“弛缓”保护,是当防空转装置动作()后,仍不起作用时,才起保护作用。
A、0.5s
B、1s
C、1.5s
D、2s
参考答案:B
从给选项中选择恰当的句子完成对话。 | |
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