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问题 单项选择题

水平地面上堆放着原木，如图所示，关于原木P在支撑点M、N处受力的方向，下列说法正确的是（）

A.M处受到的支持力竖直向上

B.N处受到的支持力竖直向上

C.M处受到的静摩擦力沿MN方向

D.N处受到的静摩擦力沿水平方向

答案

参考答案：A

阅读理解

Do you know the Money King, the great hero of the Chinese story Journey to the West? In the story, the Monkey King, Zhu Bajie and Sha Seng beat monsters and protect Tang Seng as they travel to the Western Paradise. The Monkey King was born from a stone. He can change himself into a tree, a bird or an animal. With one somersault(翻筋斗)， he can travel 108,000li. The Monkey King is clever, brave and always makes fun magic tricks. Chinese people love him very much. The Monkey King is also popular in other countries.many western kids love him and learn kung fu because of him. To them, he is a super hero, just like Superman and Spiderman.

Judge the following sentences true (T) or false (F)

小题1:The Monkey King helped Tang Seng go to the west.

小题2:The Monkey King was born in a poor family.

小题3:The Monkey King can change into many things.

小题4:The Monkey King can travel very fast with one somersault.

小题5:Western kids think the Monkey King is an animal.
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填空题

张拉千斤顶的额定吨位宜为张拉力的（）倍，且不得小于（）倍。
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