问题 多选题
如图所示,理想变压器原线圈接u=220sin100πt (V)的 正弦交流电源,图中电流表内阻不计.副线圈接入“110V,60W”灯泡一只,且灯光正常发光.下列说法正确的是(   )

A.电流表的示数为3/11 A

B.通过灯泡的电流的频率为50Hz

C.电流表的示数为3/22 A

D.理想变压器原、副线圈匝数之比为2:1

答案

AB

写作题

书面表达。

        假设你是王华.你在笔友俱乐部的网站(the Penfriend Club website)上看到一位英国朋友William的信息,

你想和他交笔友.请根据下面的提示,写一封信给他,简要地介绍自己.

要点提示:

1.你十三岁,家住通州,是一名七年级学生;

2.你有许多爱好,比如,唱歌、游泳和绘画,你梦想成为一名画家 (artist);

3.你喜欢所有的功课,擅长数学和英语;

4.老师们对你都很好,你非常喜欢学校生活.

要求:

1.书信内容必须包含所给要点,可适当发挥;

2.词数:60左右,开头和结尾已给出,不计入总词数.

Dear William,

     My name is Wang Hua. I get your address from the Penfriend Club website. I would like to be your

penfriend.

_____________________________________________________________________________

_____________________________________________________________________________

_____________________________________________________________________________

_____________________________________________________________________________

_____________________________________________________________________________

_____________________________________________________________________________

     William, please write to me soon and tell me something about yourself.

     Best wishes!

                                                                                                                                                                 Yours,

                                                                                                                                                                 Wang Hua

填空题