问题 多项选择题

变压器、电抗器试运行时应按下列()规定项目进行检查?

A.中性点接地系统的变压器,在进行冲击合闸时,其中性点必须接地。

B.变压器、电抗器第一次投入时,可全电压冲击合闸。冲击合闸时,变压器宜由高压侧投入;对发电机变压器组结线的变压器,当发电机与变压器见无操作断开点时,可不做全电压冲击合闸,只做领起升压。

C.变压器、电抗器进行5次空载全电压冲击合闸,应无异常情况;第一次受电后持续时间不应少于10min;全电压冲击合闸室,其励磁涌流不应引起保护装置动作。

D.变压器并列前,应核对(相位)。

E.带电后,检查本体及附件所有焊缝和连接面,不应有渗油现象。

答案

参考答案:A, B, C, D, E

阅读理解

Almost everyone will meet some problems when they come into a new environment. When you enter a junior high school, everything is new: new school, new teachers, new students…Then what should you do? Now I give you some advice.

When you meet problems, you should speak them out. You can tell your problems to your parents. They can help you with your problems. Of course, you can also let your teachers know. I am sure they will be glad to help you. Most of time we work and play with our classmates. You can communicate with your classmates. You will find you are not alone because they have the same problems as you.

Another way is to take an active part in the school activities. It’s good for you to make more friends. If you are good at swimming, you can join the school swimming club. If you do well in English, you can go to the English corner often.

One day, you will leave school and come into the society (社会). You will also meet many problems. The advice above will help you.

小题1:The passage mentions (提到) _______ ways to solve the problems.

A.2

B.3

C.4

D.5小题2:The underlined (划线) word“environment”in the first paragraph means _______.

A.社会

B.学校

C.环境

D.城市小题3:You can’t _______ when you are in trouble (麻烦) at school.

A.ask your teachers for help

B.tell your parents

C.take part in the activities

D.stay alone and solve the problems by yourself小题4:How many new students have the same problems in a new school?

A.None.

B.Some of them.

C.Almost everyone.

D.Everyone.小题5:The passage tells us _______.

A.how to solve the problems in a new environment

B.how to swim

C.how to take part in the swimming club

D.how to make friends

单项选择题