空压机传动机用齿轮油泵循环润滑。
参考答案：对
根据句意和首字母提示写出单词.
1. W________ to our party.
2. We do morning e________ on the playground every day.
3. My mother is a d________ at the hospital.
4. My friends usually play b________ （篮球）on the playground.
5. He can play table t________.
DN250mm截止阀的局部阻力系数是（）。
A、5
B、7
C、10
D、20
