如图所示,AB是一质量为m的均匀细直杆,A端靠在光滑的竖直墙壁上,B端置于水平地

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问题:

如图所示,AB是一质量为m的均匀细直杆,A端靠在光滑的竖直墙壁上,B端置于水平地面上,杆身与竖直方向夹角为θ,杆与地面的摩擦系数为μ,保持平衡,则此时杆与地面的摩擦力为(  )

A.mgtgθ

B.mgsinθ

C.μmg

D.μmg

考点:摩擦力的大小摩擦力的种类杠杆的平衡条件
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对“斯大林模式”的阐述不正确的是(    )

A.以苏联新宪法的颁布为形成标志

B.使苏联跻身于工业化国家的行列

C.阻碍了苏联的民主与法制建设

D.促进了苏联经济的持续发展

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有调查发现,某地区法院今年上半年受理的各种诉讼案件比去年同期有明显上升。从以上的事例中,我们可以得出如下结论( )。

A.该地区的人愈来愈喜欢诉讼

B.该地区的人法律意识越来越高

C.该地区今年的社会治安不及去年

D.该地区的人生活压力大,越来越容易被激怒

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糖皮质激素的药理作用不包括()

A.抗炎

B.抗免疫

C.抗病毒

D.抗休克

E.抗过敏

题型:选择题

The customs in different countries are rather different. If I have dinner with a Chinese host, he always puts more food onto my plate as soon as I have emptied it. That often discomforts me greatly. I have to eat the food even if I do not want to, because it is considered bad manners in the west to leave one’s food on the plate. I have also noticed that when a Chinese sits at an American’s dinner party, he often refuses the offer of drink though he’s in fact still hungry or thirsty. This might be good manners in China but it is not in the west at all. In the United States, it is impolite to keep asking someone again and again or insist on his accepting something. Americans have a direct way of speaking. If they want something, they will ask for it. If not, they will say, “No, thanks.” When an American is served with beer by the host, for example, he might say, “No, thanks. I’ll take some orange juice if you have it.” That is what an American will do. So when you go to the United States, you’d better remember the famous saying: “when in Rome, do as the Romans do.”

小题1:From this passage we can see that the writer is         .

A.a Chinese

B.a Roman

C.an American

D.a European小题2:When a Chinese host kept putting more food onto his plate, the writer felt       .

A.very happy

B.sad

C.angry

D.uneasy小题3:In the west, people consider it bad manners         .

A.to refuse an offer

B.to ask for something directly

C.to eat at a dinner party

D.to keep asking someone to accept something小题4:A guest at an American’s dinner party should show his politeness by         .

A.putting more food onto his plate as soon as he emptied it

B.refusing the offer of food or drink though he is still hungry or thirsty.

C.asking for things directly if he wants them

D.not eating all the food offered

题型:选择题

知识改变命运,高考决定命运。你怎么看?

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