问题 选择题
如图所示,理想变压器原、副线圈的匝数比为10:1,b是原线圈的中心抽头,电压表V 和电流表A均为理想电表,除滑动变阻器电阻R以外其余电阻均不计,从某时刻开始在原线圈c、d两端加上交变电压,其瞬时值表达式为u1=311sin100πt V.下列说法中正确的是(   )

A.当单刀双掷开关与a连接时,电压表的示数为22 V

B.t=1/600 s时,c、d两点间的电压瞬时值为110 V

C.单刀双掷开关与a连接,滑动变阻器触头向上移动的过程中,电压表和电流表的示数均变小

D.当单刀双掷开关由a扳向b时,电压表和电流表的示数均变大

答案

答案:D

单项选择题
写作题

读写任务。

     阅读下面的短文, 然后按照要求写一篇150词左右的英语短文。

     A passenger told an air hostess that he needed a cup of water to take his medicine when the plane

just took off. She told him that she would bring him the water in ten minutes.

     Thirty minutes later, when the passenger's ring for service sounded, the air hostess flew in a flurry

(慌了神). She was kept so busy that she forgot to deliver him the water. As a result, the passenger

was held up (耽误)to take his medicine. She hurried over to him with a cup of water, but he refused it.

     In the following hours on the flight, each time the air hostess passed the passenger she would ask

him with a smile whether he needed help or not. But the passenger never paid heed(理睬) to her. When

he was going to get off the plane, the passenger asked the air hostess to hand him the passengers'

booklet (留言本). She was very sad. She knew that he would write down sharp words, but with a

smile she handed it to him.

     Off the plane, she opened the booklet, and cracked a smile, for the passenger put it, “On the flight,

you asked me whether I need help or not for twelve times in all. How can I refuse your twelve sincere

smiles?”

[写作内容]

1. 用约30词概括文章内容。

2. 以约120个词谈谈微笑对人们的情感或行为的影响, 内容包括:

(1)你是如何看待“微笑”的作用的;

(2)谈谈你所经历的让你最感动或给你印象最深刻的一次微笑。

[写作要求]

可以使用实例来支持你的观点, 也可以参照阅读材料的内容论述, 但不得直接引用原文中的句子。

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