试题与答案

如下图所示,AOB为一杠杆(自重不计),O为支点(OA

题型:选择题

题目:

如下图所示,AOB为一杠杆(自重不计),O为支点(OA<OB,OD=OA),在A端悬挂一重物G,那么(     )

A. 在B点用力使杠杆在图示位置平衡,一定是省力的

B. 在C点用力不可能使杠杆在图示位置平衡

C. 在B点用力使杠杆在图示位置平衡,沿竖直方向最省力

D. 在D点悬挂一个与G完全相同的物体能使杠杆在图示位置平衡

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C

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题型:阅读理解

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                                            Hangzhou Bay (海湾) Bridge

     The world's longest trans-oceanic bridge (跨海大桥) started to be built four years ago in Cixi in Zhejiang

Province. Thanks to the workers' hard work, the first main step of the bridge will be finished-the southern part

and the northern one will be connected in June in 2007. In 2008, people can drive their cars on it.

     Hangzhou Bay Bridge will be 36 kilometers long. It will cost about RMB 11. 4 billion, 35% of which is

offered by many personal companies in Ningbo, and 59% is loaned (贷款) from China's different banks.

     It usually takes people over four hours to travel from Shanghai to Ningbo by car. Now the bridge will make

the journey short by 120 kilometers, making it a 179-kilometer journey. So the bridge will make the trip faster

and easier. The drive between Shanghai and Ningbo will be less than 2 hours. On the other hand, the

development is so fast that more and more foreign companies in Shanghai like to make money in Ningbo. In the

future, Ningbo and northern Zhejiang will be parts of the greater Shanghai economic zone (经济圈).

1. Will Hangzhou Bay Bridge be the world's longest trans-oceanic bridge? 

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2. Will the first main step of the bridge be finished in 2007 or 2008? 

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3. How long will Hangzhou Bay Bridge be? 

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4. Where was most part of the money for the bridge from? 

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5. Why will Ningbo be one part of the greater Shanghai economic zone? 

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