搜题请搜索小程序“爱下问搜题”
问题 问答题 简答题

计算题：如图所示，E1＝20V，E2＝10V，R1＝R2＝5Ω，求Uac。

答案

参考答案：

（1）首先列方程求出电流I顺时针：（R1＋R2）I＝E1-E2I＝（E1－E2）/（R1＋R2）=（20－10）/（5＋5）＝1A（2）用E1R1支路，取顺时针方向列方程求Uac=E1－IR1＝20－135＝15（V）

  Uac为15V。

阅读理解

根据短文判断正误：T（正确）F（错误）。

    Hello, everyone! I am Liu Yifei. My English name is Crystal. I am from Beijing. I am an actress (演员).

I'm polite (有礼的) and helpful. There are three people in my family. They are my father, my mother and I.

My father is tall and thin. He is a professor (教授). My mother looks young and slim (苗条). She is a dancer.

They are very kind. I like playing golf (高尔夫). I can speak English and Chinese very well. Huang Xiaoming

is my good friend. He is from Qingdao. He is my partner (搭档) in The Legend of Condor Hero (《神雕侠侣》).

( )1. Crystal is Huang Xiaoming's English name.

( )2. Liu Yifei is polite and helpful.

(     )3. Crystal's father is a professor.

(     )4. Liu Yifei's mother likes playing golf.

(     )5. Liu Yifei's partner is from Qingdao.

查看答案
单项选择题

( )的做法符合建设节约型国家要求。

A．对家庭用水、用电的价格进行市场调节

B．尽量减少消费

C．在自然光线充足的情况下，关闭室内照明灯

D．如果可能，尽量使用小排量汽车
查看答案