对速度控制要求响应快的拖动系统，应采用（）控制方式。
A.U/f
B.转差频率
C.无速度传感器矢量
D.有速度传感器矢量
参考答案：D
同义句转换，每空一词。
1. To eat a balanced diet is very important.
________ very important ________ eat a balanced diet.
2. They are watching TV at home now.
They are watching TV at home ________.
3. What's wrong with your sister?
What's ________ with your sister?
4. She has a sore throat.
There is something ________ her throat.
5. There is a lot of milk in the bottle.
There is ________ milk in the bottle.
衡量保险资金运用的常用指标有()。
A.保险资金运用率
B.利润率
C.资金运用盈利率
D.资产负债率
