转子在高速下油膜振荡时的涡动频率ωr与转子一阶临界转速ωk的关系是()。
A、大1/2倍
B、无关
C、相等
D、不相等
参考答案:C
根据所给提示,完成句型转换。
1. I usually have supper at six o'clock. (改为一般疑问句)
______ you usually ______ supper at six o'clock?
2.The students of our class are doing morning exercises now. (改为否定句)
The students of our class ________ __________ morning exercises now.
3. He will go to England next month. (改为反意疑问句)
He will go to England next month, _______ ________?
4. Forty people have visited the museum. (对画线部分提问)
_________ ____________ people have visited the museum?
5. (课改实验区考生做) Aunt Wang asked me to clean the room. (改为被动语态)
I _________ __________ to clean the room by Aunt Wang.
(非课改实验区考生做)
She used the knife to cut the fruit a moment ago.(改为被动语态)
The knife ________ ________ to cut the fruit by her a moment ago.
所有进入隧道工地区的人员,必须()。
A、佩戴袖章
B、按规定佩戴安全防护用品
C、遵章守纪
D、听从指挥