图示为某人用低压交流电压表和交流电流表测量一高压输电线路电压_爱下问搜题

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问题多选题

图示为某人用低压交流电压表和交流电流表测量一高压输电线路电压和电流的示意图，甲图为电压互感器，原、副线圈匝数比为m：1，乙为电流互感器，原、副线圈匝数比为1：n，若从两表读得电压表示数为U，电流表示数为I，则（　　）

A．该高压输电线路输送的电压为mU

B．该高压输电线路输送的电流为

I

n

C．该高压输电线路输送的电功率为UI

D．该高压输电线路输送的电功率为mnUI

答案

A、由变压器原理

U1

U2

=

n1

n2

得输电线路的输送电压为U₁=

n1

n2

U2=mU，故A正确；

B、由

I1

I2

=

n2

n1

，得输电线路的输电电流I1=

n2

n1

I=nI，故B错误；

C、输电线路的输送功率P=U₁I₁=mU•nI=mnUI，故C错误，D正确．

故选：AD

改错题

单句改错题

若多一词; 把多余的词写在相应的位置上,用斜线划掉

若缺一词; 在答题卡相应的位置上写出该加的词,并附带前(后)的词

若错一词; 在答题卡相应位置写出改措辞和改正后的词

1. The government spent a large number of money rebuilding the city.

2. The manager asked his men not waste any more time.

3. Geography plays a part of making dialects.

4. She shows a very positive attitude at her work

5. The textbook includes twelve units, including two revision units.

6. My friend insisted finding a taxi for me after we had a party.

7. I have 2sisters, both of them are doctors.

8. I shall never forget those years which I lived in the farm which you visited last week.

9. He is a man of great experience, from who much can be learned.

10. It depends on if it's going to rain.

单项选择题

在Serv-U中可以限制用户上传信息占用存储空间的是

A．域配额选项

B．用户配额选项

C．域上传/下载率选项

D．用户上传/下载率选项