下列关于电磁现象的说法中，正确的是（） A．电磁感应现象_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

下列关于电磁现象的说法中，正确的是（　　）

A．电磁感应现象中，电能转化为机械能

B．电动机根据导体在磁场中受力制作的

C．奥斯特发现导体周围存在磁场

D．发电机是利用电磁感应现象制成的．

答案

A、电磁感应现象中，机械能转化为电能；故A错误；

B、电动机根据通电导体在磁场中受力制作的，故B错误；

C、奥斯特实验说明了通电导线周围存在着磁场，故C错误；

D、发电机是利用电磁感应现象制成的，故D正确．

故选D．

单项选择题共用题干题

患者，男性，41岁，多饮、多食、体重迅速下降2月余，体重指数21，进不洁饮食后出现恶心、呕吐、嗜睡1天来诊。查体：意识模糊、脱水貌，呼气中烂苹果味，心率127次／分，血压80／56mmHg，甲状腺Ⅰ度肿大，未闻及血管杂音，双眼球突出16mm。

为明确诊断首先应做哪项检查（）。

A.T₃、T₄、TSH

B.尿糖、尿酮、血糖、血酮

C.血气分析

D.肾功能、电解质

E.血乳酸

完形填空

When I was in primary school, I got into a major argument with a boy in my class. I can't   16  what it was about, but I have never forgotten the   17  I learned that day.
I was   18  that I was right and he was wrong — and he was sure that I was wrong and he was right. The 19 decided to teach us a very important lesson. She 20 both of us up to the   21  of the class and   22  him on one side of her desk and me on   23 . In the middle of her desk was a large, round object. I could   24  see that it was black. She asked the boy what   25  the object was. "White," he answered.
I couldn't believe he said the object was white, 26 it was obviously black! Another 27 started between my classmate and me, this   28   about the color of the object.
The teacher told me to go stand where the boy was standing and told him to come stand where I had been. We changed   29  , and now she asked me what the color of the object was. I   30  answer, "White." It was an object with two   31  colored sides, and from his side it was white.   32  from my side was it black.
My teacher taught me a very important lesson that day: You must   33  in the other person's shoes and look at the   34  through their eyes in order to   35  understand their view.

B．fortunately

C．conversation

B．was able to

B．differently

C．beautifully

D．surprisingly

A．unexpectedly