问题
单项选择题
离心式压缩机常用的调节方法有()种。
A、3
B、4
C、5
答案
参考答案:C
离心式压缩机常用的调节方法有()种。
A、3
B、4
C、5
参考答案:C
选择合适的单词填空,将短文内容补充完整。 | |
to his mother do . On the second day, he's going to his grandparents. He's going by . On the third day, he's going to a trip his parents. He will come back home on the sixth day. He's coming plane. At last, he's going to the and buy some food. He will a good time. |