转子临界转速
参考答案:
当汽轮发电机达到某一转速时,机组发生剧烈振动,当转速离开这一数值时振动迅速减弱以至恢复正常,这一使汽轮机组产生剧烈振动的转速叫转子临界转速。
My father likes to ______ the news online every day.
A.look through
B.look up
C.look over
D.look at
监护人送养未成年孤儿有什么规定吗?