（1）有一同学用游标卡尺上标有20等分刻度的游标卡尺测一工件的长度，测得结果如图

发布时间：2017-05-20 23:20 │ 来源：www.tikuol.com

题型：问答题

（ 1）有一同学用游标卡尺上标有20等分刻度的游标卡尺测一工件的长度，测得结果如图1所示，则该工件的长度 L=______cm．

（ 2 ）某同学在探究木块与木板的动摩擦因数的实验时，设计了两种方案．

方案A：木板水平固定，通过弹簧秤水平拉动木块，如图2；

方案 B：木块固定，通过细线水平拉动木板，如图3．

上述两方案中，你认为更合理的方案是______，该实验中需要测量的物理量是______．

（ 3 ）一直流电压表，量程为1V，内阻为1000Ω，现将一阻值为5000～7000Ω之间的固定电阻R₁与此电压表串联，以扩大电压表的量程．为求得扩大后量程的准确值，再给定一直流电源（电动势E为6～7V，内阻可忽略不计），一阻值R₂=2000Ω的固定电阻，两个单刀开关S₁、S₂及若干导线．

①为达到上述目的，将答题卡上对应的图连成一个完整的实验电路图．

②连线完成以后，当S₁ 与S₂ 均闭合时，电压表的示数为0.90V；当S₁ 闭合，S₂ 断开时，电压表的示数为0.70V，由此可以计算出改装后电压表的量程为______V，电源电动势为______V．

完形填空，从A、B、C三个选项中选出能填入空白处的最佳答案。
He who has never been to the Great Wall is not a true man. The US President Barack Obama is a 1 man. 　　Obama had a 2 days' visit to China from 15th to18th November, 2009. He had a very busy schedule (日程). But he still spent 3 _visiting the Forbidden City and the Great Wall. 4 a leader visits another country, he or she sometimes goes to the country's most 5 places. It is to show the respect(尊敬) to the local 6 . For the leaders, it's also a good time to 7 during a tiring foreign trip. 　　Obama spent 50 minutes in the Forbidden City on the af ternoon of 17th November. He thinks the Forbidden City is a wonderful place to visit. He said, "I'11 8 with my girls and my wife. " 　　On 18th November, he paid a quick visit to the Great Wall at Badaling. There, he 9 a moment of peace. 　　"It's magical. It reminds you 10 the course (进程)of history , " Obama said about the Great Wall.
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