汽轮机轴封压力自动调节的任务是保持()的压力在规定的范围内。
A.轴封供汽联箱
B.汽封供汽管
C.汽封排汽管
D.汽封压力
参考答案:A
We were all waiting for you. You _____ for the seaside by yourself without
leaving a message.
A.mustn’t leave
B.shouldn’t have left
C.could not have left
D.needn’t leave
在台架试验中,舵柱扭矩达公称值时转叶式液压舵机跑舵速度不应超过().
A.0.5°/min
B.1°/min
C.2°/min
D.4°/min