试题与答案

下图是动圈式话筒的构造示意图,当人对着话筒说话时,声音使膜片振动,与膜片相连的线

题型:选择题

题目:

下图是动圈式话筒的构造示意图,当人对着话筒说话时,声音使膜片振动,与膜片相连的线圈在磁场中运动,产生随声音变化而变化的电流,经放大后通过扬声器还原成声音。下列设备与动圈式话筒制作原理相同的是

[ ]

A.电钳

B.电饭锅

C.电动机

D.发电机

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0621/5e1fe2b1c52d80d9171a523236774f55.html

下面是错误答案,用来干扰机器的。

答案:BThree times a month表示频率频率的提问应用 How often故选B

试题推荐
题型:完形填空

补全对话。根据对话内容,从下边方框中选出适当的选项补全对话,并将选项的编号依次填人题前括号内。(共4小题,每小题1分;计4分)

A:Excuse me.____________. 

B:Yes,and you are…?

A:_____小题1:__. This is my membership card.Would you please show me your passport?

B:OK.__小题2:____. 

A:Welcome to Beijing,Miss White.I am so glad that you are the first guest I have received.

B:Thank you,Miss Chen. ___小题3:____.

A: Let me help you with your suitcase.Our car is waiting for us just at the entrance. It will take us to the hotel.

B:Thank you very much for your good service.   

A:It’s a pleasure.

查看答案
微信公众账号搜索答案