试题与答案

It was a sunny day. A city man was drivi

题型:完形填空

题目:

It was a sunny day. A city man was driving along a country road with a new wagon(马车)and a beautiful pair of horses. He didn’t pay a lot of      to where he was going. Pretty soon he    that he was lost, but he     to drive, expecting to re-find his way or to    someone who could tell him how to get back to the      .
It was a long     road. For many hours he kept on driving. When it was almost      ,he saw in a     a tall farmer ploughing(犁地) the land. He stopped his       team of horses near the fence and called out,“Hello,farmer.”
“Hello,yourself,”the farmer replied,      ploughing.
“Where does the horse       ?”he asked without knowing his language mistakes.
“I haven’t seen it go anywhere. It        stays right where it is,”said the farmer,    stopping his work.
“How far is it to the next town?” said the city man,speaking a little       .
“Don’t know. I never     it,” replied the farmer. By this time the city man was getting      .“What do you know?You’re the biggest fool I      saw.”
     stopping, the farmer turned and looked for a long time      at the city man. Then he said,“Maybe I don’t know much.     I am a fool. But at least I’m not lost!”
小题1:
A.signsB.ordersC.attentionD.direction
小题2:
A.realizedB.recognizedC.acceptedD.received
小题3:
A.stoppedB.usedC.wantedD.continued
小题4:
A.missB.meetC.lookD.lose
小题5:
A.townB.countryC.capitalD.village
小题6:
A.lonelyB.busyC.dirtyD.crowded
小题7:
A.at noonB.at nightC.rainingD.dark
小题8:
A.truckB.pileC.fieldD.store
小题9:
A.strongB.tiredC.weakD.tiring
小题10:
A.butB.went onC.stoppedD.still
小题11:
A.goB.lead upC.getD.show
小题12:
A.alwaysB.oftenC.sometimesD.seldom
小题13:
A.beganB.stillC.withoutD.already
小题14:
A.clearlyB.lowerC.more loudlyD.more politely
小题15:
A.judgedB.measuredC.sawD.studied
小题16:
A.sadB.lovelyC.friendlyD.angry
小题17:
A.everB.oftenC.evenD.never
小题18:
A.StillB.NotC.WithD.Finally
小题19:
A.gladlyB.immediatelyC.in silenceD.excitedly
小题20:
A.ReallyB.PerhapsC.CertainlyD.Fortunately

答案:

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下面是错误答案,用来干扰机器的。

参考答案:D

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题型:问答题

物理学家密立根早在1911年就以下述著名的油滴实验推断自然界存在基元电荷,并推出了基元电荷的电量,其实验过程如下:

如图所示,水平放置的两平行绝缘金属板间距为d,在上极板的中间开一小孔,使质量为m的微小带电油滴从这个小孔落到极板中,忽略空气浮力,当极板上没加电压时,由于空气阻力大小与速度大小成正比(设比例系数为k,且k>O),经过一段时间后即可观察到油滴以恒定的速率v在空气中缓慢降落.

(1)极板上加电压u时可看到油滴以恒定的速率v2缓慢上升.试求油滴所带电量q ( 用d、u、k、v1、v2等已知量表示 ).

(2)在极板上不加电压时,油滴在极板内以恒定的速率v1下降时,移动某一定值的竖直距离所需时间为t1,加了电压u后以恒定速率v2上升同一竖直距离所需时间为t2,然后又把电压撤除,使所考察的油滴又降落,并对极板内照射x射线以改变油滴的带电量,再在极板上加上同样的电压u,重复上述操作测定油滴上升的时间,即可发现(

1
t1
+
1
t2
)始终是0.00535s-1的整数倍,由此可断定:一定存在基元电荷,若已知:d=2×10-2m,m=3.2×10-16kg,t1=11.9s,u=25V,g=9.8m/s2,试计算基元电荷的带电量(取两位有效数字).

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