钢轨打磨作业速度不得低于（）。A、3km/h B、4km/h C、5km/h D、6_爱下问搜题

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问题单项选择题

钢轨打磨作业速度不得低于（）。

A、3km/h

B、4km/h

C、5km/h

D、6km/h

答案

参考答案：C

判断题

测量绝缘电阻必须停电进行。

填空题

CONVERSATION 1 (Questions 1-4)

\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n

Arranging Travelling

The second speaker
\r\n plays (1)
and goes to a short (2)
The first speaker is busy with his (3)
And he encourages the second speaker to try and then he will
feel (4) better.