自动主汽门起什么作用？
参考答案：
自动主汽门在汽轮机跳闸保护装置动作后，或手打危急保安器后迅速切断汽轮机进汽、停机。
—_________ was her weekend?
—It was great. She had a party. [ ]
A. How
B. What
C. How about
D. Where
整体论的
