问题 多选题

如图所示电路,灯L1标有“24V 16W”,灯L2标有“12V 16W”。两灯串联后接在电压为U的电路中,为使它们都不被烧坏,下列说法正确的是:

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A. 两灯实际功率之比为4:1

B. 加在它们两端电压U的最大值为30V

C. 加在它们两端电压为36V时,两灯均正常发光

D. 灯L1两端电压与总电压U之比为2:3

答案

AB

改错题

此题要求改正所给短文中的错误,对标有题号的每一行作出判断;如无错误,在该行右边横线上画上一个勾(√);如有错误(每行只有一个错误),则按下列情况改正;

此行多一个词:把多余的词用斜线(﹨)划掉,在该行右边横线上写出该词,并也用斜线划掉。

    此行少一个词:在缺词处加一个漏字符号(∧),在该行右边横线写出该加的词。

此行错一个词: 在错的词下面画一横线,在该行右边横线上写出改正后的词。

注意:原行没有错的不要改。

Before lunch Allen happened to see a man fished in          小题1:________

a ditch about five metre outside a bar. Allen stopped          小题2:_______

curiously. All people passing over the man who was fishing   小题3:_______

regarded him like a foolish man. Allen’s heart went out        小题4:______

of him. He said kindly to fish-catcher, “Hello, will           小题5:_______

you please do me a favor and have a drink with me          小题6:________

in the bar?” The man gladly received his invitation.         小题7:____

After buying the man several cups soft-drinks,             小题8:________

Allen asked, “You are fishing there, right? May I           小题9:________

know how much fish you have caught this morning?”        小题10:______

“You are the number 8,” said the man humorously.

问答题 简答题