问题 多项选择题

转速负反馈调速系统对()等扰动作用都能有效地加以抑制。

A、负载变化

B、给定电压变化

C、电动机大励磁电流变化

D、直流电动机电枢电阻

E、交流电压波动

答案

参考答案:A, C, D, E

阅读理解

阅读理解。

     If a person forgets names, places or facts -and has trouble with everyday things like reading or

shopping-it may not mean you are getting old. It could be Alzheimer's disease. So it's important to see

a doctor as soon as you can.

     There is no cure for Alzheimer's. But a drug called ARICEPT has been used by millions of people

to help their symptoms (症状).

      In studies, ARICEPT has been proved to work for Alzheimer's. It has helped people improve their

memory over time. It has also helped them to keep doing everyday things on their own.

     Ask your doctor if ARICEPT is right for you or your loved one. It is the Number One drug for

Alzheimer's in the world. The sooner you know it's Alzheimer's, the better ARICEPT can help.

     ARICEPT is good for many but may not be good for everyone. Some people may experience not

sleeping well, feeling very tired, or not wanting to eat. In studies, these side effects weren't serious at

all and went away over time. Some people taking ARICEPT may feel light-headed. In this case you

should tell your doctors because your condition may get worse.

1. If one suffers from Alzheimer's, _____.

A. he has trouble with his memory

B. he can't do everyday things on his own

C. he often forgets things because he is old

D. he can't move about

2. What is ARICEPT?

A. A medicine to cure Alzheimer's

B. A medicine to delay signs of aging.

C. A medicine to reduce the symptoms of Alzheimer's.

D. A medicine to cure brain damage.

3. One who is taking ARICEPT should go to see a doctor if he _____.

A. can't fall asleep

B. feels tired out

C. has no desire to eat

D. feels like a drunken man

单项选择题