喷嘴调节
参考答案:
外界负荷变化时,进入汽轮机的蒸汽通过依次启闭的调节阀,改变汽轮机第一级的数目达到改变第一级的通流面积,使汽轮机进汽量变化,以改变汽轮机功率的调节方法。
At that time, education _____ for white settlers only and few black people had the chance to go to school.
A.intended
B.was intending
C.had intended
D.was intended
服务员整理办公桌时,避免对着()咳嗽、或打喷嚏。