公路上有一排电线杆,共25根,每相邻两根间的距离是45米,现在要改成60米,可以有( )根不需移动。
7
Directions:
A. Study the following picture carefully and write an essay in no less than 160-200 words.
B. Your essay must be written clearly on ANSWER SHEET 2.
C. Your essay should meet the requirements below:
1) Describe the picture
2) interpret its meaning, and
3) give your comments.
变电事故处理的原则是