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是原线圈的中心接头,电压表V和电流表A均为理想电表.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u=220sin100πt(V).下列说法正确的是(  )

A.当单刀双掷开关与a连接时,电压表的示数为22V

B.当单刀双掷开关与b连接时,电压表的示数为11V

C.当单刀双掷开关与a连接,滑动变阻器触头P向上移动的过程中,电压表的示数不变,电流表的示数变大

D.单刀掷开关由a扳向b时(滑动变阻器触头P不动),电压表和电流表的示数均变大

答案

答案:D

完形填空

先阅读短文,然后根据短文内容在短文空白处填入一个适当的词,使短文完整、通顺,所填单词的首字母已给出。将填入空白处的单词写在答题卡上的相应题号后.

I was in a strange city and I didnt know the city at all.And what is more,I could not speak a word of the 小题1:l______.After having spent my first day in the town center,I decided to lose my way on my second day,since I was sure that this was the better way of 小题2:g____to know the strange city.I got on the first bus in the morning,rode on it for several stops,then got off it and walked on.The first two hours 小题3:p_____ happily enough.Then I decided to turn back to my 小题4:h______for lunch.After walking about for some time,I decided I had better ask the way.The小题5:t_______ was that the only word I knew of the language was the name of the hotel in which I 小题6:l________ and even that I pronounced badly.

I stopped to ask a friendly-looking小题7:n______ seller.He smiled and handed me a paper.I shook my head and repeated the name of the hotel and he put the paper into my hands,I had to give him some 小题8:m_______and went on my way.Then I met a policeman.I asked him at once.The policeman listened to me carefully.Smiled and took me 小题9:b_______the arm.There was a strange look in his eyes as he pointed left and right and left小题10:a_____.I thanked him politely and began walking on.

About an hour passed and I found that the houses were getting fewer and fewer and green fields could be 小题11:s_____ on either side of me.I had come all the way into the country.The thing left for me to do was to find the nearest bus station.

单项选择题