无煤柱开采有利于防止煤炭自燃发火。

题型:判断题

问题:

无煤柱开采有利于防止煤炭自燃发火。

考点:瓦斯检查工考试瓦斯检查工考试题库
题型:判断题
x1,x2是方x2+x+k=0的两个实根,若恰x12+x1x2+x22=2k2成立,k的值为(  )
A.-1B.
1
2
或-1
C.
1
2
D.-
1
2
或1
题型:判断题

在一幅比例尺为1:5000000的地图上,量得上海到杭州的距离是3.4cm,如果按地图中所测量的路线修一条铁路,一列匀速运动的火车,以每小时170km的速度在这条铁路上行驶,求这列火车从上海到杭州所需要的时间.

题型:判断题

什么是消弧线圈补偿系统电容电流?

题型:判断题

点数时按照()的原则。

A、从上到下、从左到右

B、从右到左

C、从下到上

D、按照初盘表中商品的顺序

题型:判断题

Directions:

You are a college student in the English Department. Recently you have been made monitor in your class and you are going to make a speech in front of your classmates. You’ll make preparations for the speech in which you should

1) express your pleasure,

2) state briefly your moves,

3) and give complimentary remarks.

Write your letter in no less than 100 words. Write it neatly on ANSWER SHEET 2.

Do not sign your own name at the end of the letter, use "Li Ming" instead.

Do not write the address.

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