调整时间Ts
参考答案：
响应曲线达到接近稳态值的±5％（或±2％）之内时所需要的时间，定义为调整时间
二、句型转换 ( 10分)
1. They pretended that they were barbers.
They pretended ____________ ______________ barber.
2. Honestly speaking, I don’t want to stay here any longer.
________ ________, I don’t want to stay here any longer .
3. In fact, I landed in Britain by accident．
In fact, I _________ ____________ land in Britain.
4. Because of the bad weather, a few students were absent from school.
The bad weather _________ __________ a few students’absence of school.
5. It would be wrong that I don’t trust a gentlman.
It would be wrong ________ me ________ _________ trust a gentlman.
服务是指能够满足客人某种需求的（）。
A.特殊产品
B.特殊方式
C.特殊商品
D.特殊消费
