电力系统稳定器PSS的作用为在AVR电压终合点处加一个附加的信号用以阻尼由于电气输电

藻类的死亡和腐败，引起水体（）的大量减少，导致富营养化。

A.有机物

B.营养物质

C.溶解氧

D.悬浮物

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' purpose to write the passage?

A. To encourage.  

B. To compare.  

C. To prove.

D. To explain.

直流系统并列有哪些注意事项？

SmartPartition的作用是什么（）。

A.利用SSD扩展二级缓存

B.存储资源虚拟化

C.针对核心业务指定缓存配额（分区）

D.卷空间共享，按需分配