试题与答案

考虑到信号系统的安全性缘故,在系统中使用了()个里程脉冲发生器。

题型:填空题

题目:

考虑到信号系统的安全性缘故,在系统中使用了()个里程脉冲发生器。

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C

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