试题与答案

山区河流丘陵宽浅型河段,河岸两侧形成的沙卵石淤积体,洪水期淹没,枯水期露出水面,称为

题型:单项选择题

题目:

山区河流丘陵宽浅型河段,河岸两侧形成的沙卵石淤积体,洪水期淹没,枯水期露出水面,称为().

A、边滩

B、碛

C、坝

D、沙埂

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B

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题型:完形填空
Mr. Smith lived in a village. He had ___36__ farms and about twenty people working for him. He often told them _37_ hard and be honest. (诚实的).
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Some of the workers answered, ‘We ___43___.’
The others said, ‘We saw nothing.’
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As soon as he finished, four workers began to cry. ‘Oh, dear!’
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‘We ate the bread when you were out. We are going to die.’ One of them cried.
‘___48___,’ Mr. Smith said _49___ a smile, ‘I only ____50_____ you. Use your head.’
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A.a fewB.fewC.littleD.a little
小题2:
A.workB.workingC.workedD.to work
小题3:
A.inB.atC.forD.with
小题4:
A.two B.manyC.aD.some
小题5:
A.went outB.came inC.enteredD.got in
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A.shouldn’tB.couldn’tC.wouldn’tD.mustn’t
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A.foodB.the breadC.drinksD.apples
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A.didB.didn’tC.doD.doesn’t
小题9:
A.TheyB.WeC.WhatD.There
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A.tookB.boughtC.putD.needed
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A.ThatB.Before C.IfD.Until
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A.How are youB.What are you doing
C.Did you have lunchD.What’s wrong with you
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题型:计算题

如图所示电路中,电源两端的电压为6V,且保持不变,定值电阻R1、R2的阻值不随温度变化。电阻R1=5Ω,滑动变阻器的最大阻值为R3。闭合开关S、S1,断开开关S2,将滑动变阻器的滑片P移到b端,电阻R1两端电压U1=1.2V。

(1)求通过滑动变阻器的电流大小;

(2)求滑动变阻器的最大阻值;

(3)当开关S、S1和S2都闭合时,将滑动变阻器滑片P移动到a端,测得干路电流为1.5A,求电阻R2的阻值。

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