什么是循环水泵?
参考答案:
在发电厂中,向凝结器供给冷却水及冷却汽轮机排汽的水泵叫循环水泵。
The terrible fire broke out suddenly. The family, luckily, was able to _____ it in time.
A.get off
B.get away from
C.get out
D.get on
请选出以下哪些是润滑油的作用?()
A、减振
B、卸荷
C、密封
D、保温