试题与答案

玄天上帝来历如何?

题型:问答题 简答题

题目:

玄天上帝来历如何?

答案:

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题型:阅读理解与欣赏

我的家     

我有一个幸福的家。

爸爸爱我, 

妈妈爱我, 

我也爱爸爸妈妈。 

在温暖的家中,

 我快乐地长大。

1.儿歌中,我的家里有             、            和              。 

2.说说你的家里有哪些人,你了解他们最喜欢干什么?

                                                                                                                           

爸爸最喜欢____                ,妈妈最喜欢______                                 最喜欢____                         ,

____         最喜欢                                             

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题型:改错题
短文改错。
    When tea and coffee was first introduced to Europe      
in 18th century,people thought they were harmful.          
So the king of Sweden decided to find  whether this      
was true or not.  It was happened that there were two      
brothers whose were in prison at the time. The king ordered
one of them to drink tea every day and the others coffee.  
Both of them have lived many years without any problem.    
At last the one who had to drink tea every day dead at      
the age of 83 and the other lived even long.  Because of    
this,Sweden is today one of the countries where many       
tea and coffee are drunk.
1. _____
2. _____
3. _____
4. _____
5. _____
6. _____
7. _____
8. _____
9. _____
10. _____
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题型:计算题

工人用滑轮组提升水中物体A,如图所示。在物体A完全在水面下被匀速提升的过程中,工人对绳子竖直向下的拉力为F1,水平地面对工人的支持力为FN1;滑轮组的机械效率η1为60%。当物体A完全打捞出水面后被匀速提升的过程中,滑轮组的机械效率为η2,工人对绳子竖直向下的拉力为FN2。水平地面对工人的支持力为FN2。已知工人所受重力为500N,FN1:FN2=7:2;物体A所受重力为1000N,不计绳重、滑轮与轴的摩擦以及水的阻力,g取10 N/kg。求:

(1)动滑轮所受重力G

(2)物体A的密度ρA

(3)滑轮组的机械效率η2

(4)当物体A完全在水面下,以0.1m/s的速度被匀速提升时,滑轮组做功的功率P1。(请画出相关受力分析图)

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