纵向水平杆应设置在立杆内侧，单根杆长度不应小于（）跨。A.1 B.2 C.3 D.4

下面几种故障中，会破坏正在运行的数据库的是______。

A) 中央处理器故障
B) 操作系统故障
C) 突然停电
D) 瞬时的强磁场干扰

李娟同学买了5支圆珠笔与3本练习本，共付7.2元，每本练习本0.4元，每支圆珠笔多少钱？（用方程解）

阅读理解。

     It is common and usual to see people freak out when they face challenges in their life. We all pass

in different life problems and challenges. No one is free of life problems. Only a dead man faces no

problem. As long as you are alive, challenges are everywhere.

     How do you face problems and challenges in your life? Problems and challenges are the building

blocks of your personality. They make you who you are. Besides, whether what happened in your life

builds or destructs you depends on how you look at it. If you take your problems as troubles, they will

be troubles and may cause destruction. If you take them as constructive tools, you are going to be built

up on them.

     Problems are everywhere. No one can avoid them. And they are good too. They open up a different

look and opportunity if you are willing to see. When you face troubles, do not frustrate or freak out. Just

cool yourself to think in a different direction. Think in a positive way. Every problem has its own good as

well as bad sides. Focus on the good one. Look at the bright side.

    Besides, there is always a good person, perhaps your mom or dad, or one of your friends, right beside

you who can turn everything into your best if you are willing to turn to them. No matter what happens,

they will be there to help you. Trust them and they will never let you down. All you need to know is that

you are loved wherever you are.

1. What's the meaning of the underlined phrase "freak out" in Paragraph 1?

A. Feel shy.    

B. Stay calm.  

C. Keep up.    

D. Feel upset.

2. In Paragraph 2, the writer implies that ______.

A. problems cause troubles  

B. attitude is everything

C. challenges can be avoided  

D. personalities are built on failures

3. According to the last paragraph, when we're in trouble, we ______.

A. can only depend on our parents      

B. are not alone

C. should only believe ourselves        

D. are not confident

4. What's the writer's purpose to write the passage?

A. To encourage.  

B. To compare.  

C. To prove.

D. To explain.

5. What can be the best title of the passage?

A. How to Avoid Problems    

B. Challenges Are Everywhere    

C. Face Your Challenges Bravely        

D. You Are Loved Wherever You Are

PFM的肩台宽度应为（）。

A.0.3～0.5mm

B.0.5～0.8mm

C.1mm

D.1.5mm

E.2mm

需要从车窗逃生时，用安全锤敲击安全玻璃的（）

A.四个角落部位

B.中心部位

C.中下部位

D.任意部位