某交流电电源电压的瞬时值表达式为u=6sinl00πt(V),则下列说法中正确的

题型:选择题

问题:

某交流电电源电压的瞬时值表达式为u=6sinl00πt(V),则下列说法中正确的是(  )

A.用交流电压表测该电源电压时,示数是6V

B.用交流电压表测该电源电压时,示数是6V

C.用此电源给电磁打点计时器供电时,打点的时间间隔为0.01s

D.把标有“6V 3W”的小灯泡接在该电源上时,小灯泡将被烧毁

考点:正弦式交变电流
题型:选择题

三相系统各种设备分类中属于Ⅳ的一组是( )。

A.需要将瞬态过电压限制到特定水平的设备
B.家用电器、手提工具和类似负荷
C.配电盘,断路器,包括电缆、母线、分线盒、开关、插座等的布线系统,以及应用于工业的设备和永久接至固定装置的固定安装的电动机等一些其他设备
D.电气计量仪表、一次回路过电流保护设备、滤波器

题型:选择题

关于烧伤后肝损害,叙述正确的是()

A.胆红素增多

B.凝血酶原时间缩短

C.高蛋白质营养

D.避免应用对肝细胞有毒的药物

E.结合胆红素降低

题型:选择题

2011年1月1日,B企业取得了位于A市市中心的一商业建设用地使用权。按照建设用地使用权出让年限规定,如果该项出让合同约定的使用年限届满,B企业需要继续使用该幅土地的,应当至迟于()申请续期。

A.2050年1月1日~2050年12月31日

B.2051年1月1日~2051年12月31日

C.2060年1月1日~2060年12月31日

D.2061年1月1日~2061年12月31日

题型:选择题

American parents usually think that their child should not have more pocket money than the children with whom he regularly connects, even if they are wealthier.But neither are children expected to compare with the richer if a large family, heavy responsibilities, or other conditions make it necessary to give a child less spending money than is customary (惯例的)in the neighborhood.

Whatever the pocket money is, its entire use is not controlled by the parents, because a child learns to use money correctly only through dealing with it himself.If a seven-year-old child gets a quarter as a week pocket money and is made to put it all in his piggy bank to save it up, he gets no idea what the real use for the money is.He gets the shiny coins and they soon disappear.

The idea of a bank account is too early for so small a child, although he can be made to understand and enjoy saving his coins—not all of them, only a part of what he receives—to buy something he especially wants.By the time he is eight he is old enough to take part in the opening of his own savings account, parents may take him to the bank, open a savings account for him and encourage him to put a certain quantity or any checks he receives as gifts into the bank and watch his bank savings grow as entry by entry(存入) is made.

He will be saving, earning, and spending suitable quantities all along in order to learn how to manage money and to keep him in a favorable position with his friend.The boy who can't join his fellows in a sweet shop once in a while, because he has to save every cent he gets or earns for some big unknown project his parents have chosen for him, is a sorry child.

小题1:Choose the best exolaration for the underlined part in the second paragraph.

A.It is a kind of bank run by children.

B.It is a contralre in the shape of a pig for saving coins.

C.It is a certain place in which pigs are raise.

D.It is a bank whose building looks like a pig小题2:Which of the following statements is TRUE?

A.Most of the rich people in America give children much pocket money.

B.American children usually have their bank accounts until they are eight.

C.American parents seldom care for their children's spending money.

D.American children begin to learn how to manage money when very young.小题3:Suppose an 8-year-old child receives 10 dollars as his birthday gift, he may probably ____.

A.spend the money on the things he wants

B.compare the gift with that of his friend

C.have most of it saved in the bank

D.put all the money in his piggy bank小题4:Why does the writer think the boy is a sorry one if he saves every cent he gets or earns?

A.Because he can not manage his money and is kept himself in an unfavorable position

B.Because he can not join the fellows in a sweet shop once in a while

C.Because he can not learn the use of money through spending it himself

D.Because he can not have any other choice but save, earn of spend money

题型:选择题

复合控制 ( compound control )

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