在图中,A装置是_______滑轮(选填“定”或“动”)。若用20N的拉力将旗帜

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问题:

在图中,A装置是_______滑轮(选填“定”或“动”)。若用20N的拉力将旗帜匀速提升10m,则拉力所做的功为______J。

考点:杠杆及其五要素
题型:填空题
Mr. White is a farmer. Last month he 36 his truck to town and on the way his truck knocked down a  37  and hurt him. He sent the boy to a  38 at once. He paid a lot of money for that, but the boy’s  39 wanted to get more money from him. So they said their son could no longer lift his 40 arm above his head.
Mr. White’s lawyer(律师) came and asked the boy a few questions in the court(法庭). “Now, my boy,” he said, “you were hurt 41 , weren’t you?” “Yes, sir,” said the boy. “And you can’t lift your right arm now, can you?” “42 , sir.”
“Could you 43  us how you can lift your right arm?” Slowly the boy lifted his right arm before his nose. “Poor boy,” said the lawyer. “And how 44  could you lift it before the accident?” “Oh, very high,” said the boy proudly (自豪) and the arm went up right over his 45 .
小题1:
A.tookB.broughtC.madeD.drove
小题2:
A.girlB.parentC.boyD.farmer
小题3:
A.hospitalB.homeC.farmD.court
小题4:
A.grandfatherB.fatherC.parentsD.mother
小题5:
A.leftB.rightC.bothD.one
小题6:
A.last monthB.this monthC.yesterdayD.last week
小题7:
A.YesB.Of courseC.Yes, I can’tD.No
小题8:
A.showB.tellC.sayD.ask
小题9:
A.lowB.high C.far D.near
小题10:
A.nose B.arm C.head D.right arm
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水在核反应堆中的作用是使核反应堆中产生的中子减速。()

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江苏省政协十届二次会议期间,许多委员围绕保持全省经济平稳较快发展、改善民生促进社会和谐,集思广益,出谋献策。这表明政协       (    )

A.具有参政议政的职能

B.是代表人民行使国家权力的国家机关

C.参与国家大政方针的制定和执行

D.是具有广泛代表性的爱国统一战线组织

题型:填空题

两块板厚相同的钢板的对接接头,材料为Q235A钢。已知焊缝长度为100mm,板厚为8mm,Q235A钢的焊缝许用拉应力[σ′t]为167MPa,求该焊缝能承受多大拉力?

题型:填空题

下列各项中,符合增值税纳税义务发生时间规定的是()。

A.纳税人进口货物,为报关进口的当天

B.采取预收货款方式销售货物,为货物发出的当天

C.纳税人发生视同销售货物行为,为货物移送的当天

D.采取托收承付和委托银行收款方式销售货物,为发出货物并办妥托收手续的当天

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