一理想变压器,原线圈匝数n1=1100,接在电压220V的交流电源上,当它对11

题型:问答题

问题:

一理想变压器,原线圈匝数n1=1100,接在电压220V的交流电源上,当它对11只并联的“36V,60w”的灯泡供电时,灯泡正常发光.

求出:(1)副线圈的匝数n2?(2)通过原线圈的电流 I1

考点:变压器的结构和原理
题型:问答题

阅读短文,根据中文填写适当的单词,使意思完整,每空一词。

     "For those who have never been to Tibet, Tibet is a 1______ (梦想); for those who have ever been there,

Tibet is a memory." said Li Wan, a graduate from Zhongshan University.

     Ms. Li became interested in Tibet after having worked in a company for less 2______ (比……) three

months. 3______ (自从) 1998, Li has been spending 4______ (大部分) of her time on the challenge ---she

has got to almost every 5______ (角落) of Tibet during the 8 years.

     Li's 6______ (第一) trip to Tibet was only out of her loving freedom. She entered Tibet along the

Yunnan-Tibetan road. Although she couldn't say a word of Tibetan language, this did not really 7______

(阻止) her from talking with local people successfully."To me, they are free, 8______ (友好的), happy

and close to nature. People should live in this way, singing while 9______ (工作), dancing while living,"

Li said.

     Li describes Tibet in words and 10______ (照片). "My goal in the next ten years is to make a good

documentary." said Li.

题型:问答题

It is suggested that another school ______ in our city. [ ]

A. should build

B. be set up

C. will be set up

D. will build

题型:问答题

下列属于人类特有反射的是

A.吃梅止渴

B.嗅梅止渴

C.看梅止渴

D.谈梅止渴

题型:问答题

转子流量计也称等压降、等流速流量计。

题型:问答题

从媒介技术演变的角度可将媒体大致分为()

A.书写媒体

B.印刷媒体

C.电子媒体

D.互动媒体

E.语言媒体

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