《煤矿矿井机电设备完好标准》规定，对运转中通风机技术测定测得_爱下问搜题

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问题单项选择题

《煤矿矿井机电设备完好标准》规定，对运转中通风机技术测定测得效率不低于设计效率的（）。

A.70%

B.80%

C.85%

D.90%

答案

参考答案：D

完形填空

完形填空

         Water is the "life blood" of our earth. Like air and sunshine, it is very important   1   living things. Without water, there can be   2   life on the earth. All animals and plants need water. Man also needs water. We need water to drink, to cook and to clean   3   . It even   4 the greater part of our bodies.
        Water is almost everywhere. Even in the   5   places of the world, there is water in the air. However, we can drink not seawater but fresh water.
        To make things even  6   ,people often   7   to keep the water clean. They throw rubbish into rivers, lakes or seas. So not all the fresh water is   8   for us to drink. We're short    9   water. Something must be   10   to stop this.

( )1. A. for
( )2. A. none
( )3. A. himself
( )4. A. made of
( )5. A. driest
( )6. A. best
( )7. A. decide
( )8. A. clean enough
( )9. A. for
( )10. A. do

B. to
B. not
B. our
B. make
B. wetter
B. worse
B. try
B. enough clean
B. in
B. did

C. of
C. much
C. us
C. makes up
C. drier
C. worst
C. fail
C. enough good
C. at
C. doing

D. towards
D. no
D. ourselves
D. made in
D. beautiful
D. better
D. take
D. dirty enough
D. of
D. done

问答题简答题

110kV变电站，有两台主变，其中110kV有4回出线，采用双母线接线，请用规定的图形符号、文字符号画出110kV电压等级接线图。