问题 多选题
如图所示,理想变压器原副线圈匝数之比为4:1,原线圈接入一电压为u=220sin100πtV的交流电源,副线圈接一个R=27.5Ω的负载电阻.则下述结论正确的是(  )

A.副线圈中电压表的读数为55V

B.副线圈中输出交流电的周期为0.01s

C.原线圈中电流表的读数为0.5A

D.原线圈中的输入功率为110W

答案

AC

完形填空

请仔细阅读下 * * 题中五个人想参加的活动的描述,从A-F提供的各活动的简介中选出各自相匹配的选项。有一个多余选项。

小题1:Maria is having her birthday party tomorrow evening. And she wants to go out for the whole day with her friends. They all enjoy listening to pop music.

小题2:Glenda is studying the history of music at college. She wants to listen to as much music from the past as possible, and specially likes listening to people singing.

小题3:Li Jie is a dancer from China. He would like to see people dancing from as many other parts of the world as possible so as to have some new ideas.

小题4:Ruth is a teacher who is planning to start a drama (戏剧) club for the children at her school. She would like to see some children acting if possible.

小题5:Joe is studying English. He hopes either to write plays or to be an actor. He enjoys programs about real people whose lives are very interesting.

A.International Youth Celebration (庆祝) (getting together with students from different countries, dancing and singing)

B.Songs of Summer (Hutton Consort will sing songs old and new, all of which are about summer)

C.Music in the Open Air (Jimmy Locke and his band play dance music through the day in the open air)

D.Varied (多彩的) Music Evening (a great evening with the latest pop songs and dancing)E. A Star May Be Born (some plays from children’s stories are showed by 7 to 11-year-old children for parents, families and friends)

F. Vita and Harold a TV interview about a couple’s (夫妻的) lives and their most unusual marriage (婚姻)

单项选择题