如图所示,半径为R,重为G的均匀球靠竖直墙放置,左下方有厚为h(h<R)的木块,

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问题:

如图所示,半径为R,重为G的均匀球靠竖直墙放置,左下方有厚为h(h<R)的木块,若不计摩擦,用至少多大的水平推力F推木块才能使球离开地面?

考点:滑动摩擦力、动摩擦因数力的合成共点力的平衡
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沈氏女科归纳带下病的病因包括 ()

A.脾虚

B.湿痰

C.湿火

D.相火

E.阴虚不守

题型:问答题

选词填空

eating,reading,aunt,shopping,homework,Where,doing,sister,family,Who  

A: Look at the photos of my family. This is my brother.  

B:   1   is he? Is he in the library?

A: No, he's in the living room He is   2   his homework. And that's my    3   .

B: Is she doing her  4    ,too?  

A: No, she is seeing a movie on TV and  5    French fries. And this is a picture of my   6  and my mother at a mall. They like    7    .

B:    8    .is the man on the sofa?

A: My father. He is   9    a newspaper.

B: You have a happy    10  .  

1.         2.        3.         4.         5.           6.         7.         8.         9.         10.        

题型:问答题

下列哪项不是直接导致残疾的原因

A.新生儿核黄疸

B.大面积脑梗死

C.严重脑外伤

D.精神分裂

E.短暂性脑缺血发作

题型:问答题

全面性强直-阵挛发作(GTCS)可分三期

A.强直期→阵挛期→惊厥后期
B.阵挛期→强直期→惊厥后期
C.抽搐期→强直期→惊厥后期
D.阵挛期→惊厥期→惊厥后期
E.强直期→抽搐期→缓解期

题型:问答题

燃烧放热规律三要素是()、燃烧放热规律曲线形状和燃烧持续时间。

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