搜题请搜索小程序“爱下问搜题”
问题 单项选择题

《既有线200～250km/h线桥设备维修规则》规定，钢轨顶面上有长度大30mm且深度大于5mm的掉块判为（）。

A、轻伤

B、重伤

C、轻伤有发展

D、折断

答案

参考答案：D

填空题

根据短文内容，用方框中所给词的适当形式填空，并用其正确形式填空，使短文完整，正确。（每个词只能用一次；共10分，每小题一分）

Light travels at a speed(速度) which is about a million times faster than that of sound .小题1:

    One second, light travels about 300000 kilometers, but sound travels only 340 小题2:     .  You can get some idea of this difference by 小题3:________ the start of a running match. If you stand far away from the starter(发令员), you can see smoke小题4:________ from his gun before the sound reaches your ears.

The 小题5:     speed of light produces some strange facts. The 小题6:    star is so far away that light which you can see from it tonight started to travel to you  four years 小题7:________ at a speed of nearly two million kilometers every minute. The light from some of tonight's started on小题8: ________ journey towards you even before you were born.

So, if we want to be honest(诚实), we can not say , " The stars are shining 小题9: ________tonight."  We have to say, " The stars look nice. They were 小题10:_______ four years ago but their light has just reached our earth. "
查看答案
单项选择题

隧道施工监控量测的必测项目之一是______。

A．地表下沉
B．围岩弹性波
C．拱顶下沉
D．围岩体内位移
查看答案