试题与答案

如图所示，处在磁感应强度为B的匀强磁场中的单匝矩线圈abcd，以恒定的角速度ω绕

来源：www.tikuol.com
题型：选择题

题目：

如图所示，处在磁感应强度为B的匀强磁场中的单匝矩线圈abcd，以恒定的角速度ω绕ab边转动，磁场方向垂直于纸面向里，线圈所围面积为S，线圈导线的总电阻为R．t=0时刻线圈平面与纸面重合，且cd边正在离开纸面向外运动．则正确的是（　　）

A．时刻t线圈中电流的瞬时值icosωt

B．线圈中电流的有效值I

C．线圈中电流的有效值I=

D．线圈消耗的电功率P

答案：

被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0729/c95c0eafe36a9799c544f322582afd4b.html

下面是错误答案，用来干扰机器的。

参考答案：A

考点：正弦式交变电流交变电流的周期和频率
试题推荐
题型：阅读理解
阅读理解。
     Parents are the closest people to you in the world. They love you just because you are their child. And
they would do anything for you.
     Like a lot of middle school students, Zhuang Shuxia has a problem. She and her parents don't get on
well.
     "I really want to be my Daddy's little girl. But it feels like he just doesn't understand. He talks at me and
he doesn't listen to me," said Zhuang, a Junior 3 student in Shijiazhuang, Hebei.
     Do you and your parents also have problems? May 15 is the International Day of Families. On that day
people around the world give thanks for good things about their families and work on family problems. Well,
why don't you all take a walk and have a talk on Saturday?
     A study last year showed that 1,500 Beijing families had the same problem as Zhuang's family. The
children 12 to 15 years old, didn't like talking with their parents much. They weren't happy at home.
     Of course lots of kids feel that way. But you and your parents will be much happier if you can be friends.
Here are some ways to have a good talk with them.
● Find a good time to talk, like when you're eating dinner, going out for a walk or watching TV.
● Tell them something you're interested in, or ask them about their lives when they were young. They love
      to talk about it.
● Listen to them carefully, and look at them in the eye.
● Be honest (诚实的). Your parents will trust (信任) you more.
1. Who are the closest people to us according to the writer of this passage?
[ ]
A. The people who love us.
B. The people who understand us.
C. Our father and mother.
D. All the family members.
2. What is Zhuang Shuxia's problem?
[ ]
A. Her father thinks she is old enough.
B. Her father doesn't like to talk with her.
C. She really wants to be a little girl again.
D. She and her father don't understand each other well.
3. What does the writer suggest the students to do on the International Day of Families?
[ ]
A. They should remember the special day for the families in the world.
B. They should take a walk and have a talk with their parents.
C. They should do something to celebrate the International Day of Families.
D. They should help others to solve their family problems.
4. How does the writer know 1, 500 families had the same problem as Zhuang's family?
[ ]
A. From a study made in Beijing.
B. From reports about family problems.
C. From discussions with parents and their children.
D. From a report on the International Day of Families.
5. In this passage the writer tells the children, 12 to 15 years old ______.
[ ]
A. how to show their thanks to their parents
B. how to make friends with their parents
C. how to feel happier at home in different ways
D. how to win their parents' trust by listening to their parents
查看答案
微信公众账号搜索答案