问题 单项选择题

根据《长途光缆波分复用(WDM)传输系统工程验收规范》,槽道和走线架安装时,吊挂安装的膨胀螺栓打孔位置不宜选择在机房主承重梁上,确实避不开主承重梁时,孔位应选在距主承重梁下沿()mm以上的侧面位置。

A.60

B.80

C.100

D.120

答案

参考答案:D

阅读理解

阅读理解。

                                             Just a Quick Nap  只要打个盹儿

     Do you feel a little sleepy after lunch? Well, that's normal. Your body naturally slows down then.

'What should you do about it? Don't reach for a coffee! Instead, take a map.

     It's good to have a daily nap. First of all, you are more efficient(有效的) after napping. You

remember things better and make fewer mistakes. Also, you can learn things more easily after taking a

nap. A nap may increase your self-confidence (自信) and make you more active. It may even cheer

you up. But, there are some simple rules you should follow about taking a nap. First, take a nap in the

middle of day. Next, a 20-minute nap is best. If you sleep longer, you may fall into a deep sleep. After

waking from a deep sleep, you will feel worse. Also, you should set an alarm clock. In that way, you

can fully relax during your nap. You won't have to keep looking at the clock so you don't oversleep.

    Now, the next time you feel sleepy after lunch, don't get stressed. Put your head down, close your

eyes, and take a nap.

l. It is _____ to get sleepy for you at noon. 

A. normal        

B. strange      

C. amazing

2. After taking a nap, you may feel more _____.

A. stressed      

B. confident  

C. sleepy

3. The proper period (一段时间) of time for taking a nap is _____.  

A. as long as you like

B. eight hours

C. about twenty minutes

4. What can help you have a fully relaxing nap according to the passage?

A. A cup of coffee.

B. A quick meal.

C. An alarm clock.

5. What is the text mainly about?

A. Why and how to take a nap.

B. Rules to increase your self-confidence.

C. How to make your body slow down.

多项选择题