如图所示,在场强为E的竖直向下匀强电场中有一块水平放置的足够大的接地金属板,在金

题型:计算题

问题:

如图所示,在场强为E的竖直向下匀强电场中有一块水平放置的足够大的接地金属板,在金属板的正上方高为h处有一个小的放射源,放射源上方有一铅板,使放射源可以向水平及斜下方各个方向释放质量为m、电量为q初速度为v0的带电粒子,粒子最后落在金属板上,不计粒子重力,试求:

(1)粒子打在板上时的动能;

(2)计算落在金属板上的粒子图形的面积大小。

考点:动能定理电场强度的定义式
题型:计算题

下图漫画启示我们,办事情要(  )

A.发挥主观能动性,发现真理

B.积极做好量的积累,反复实践

C.坚持一切从实际出发,实事求是

D.善于抓住主要矛盾,解决问题

题型:计算题

甲国刑法规定,外国人在甲国领域外对甲国国家或者公民犯罪,按照甲国刑法规定的最低刑为3年以上有期徒刑的,可适用甲国刑法。这属于国际法所规定的哪些管辖权( )。

A.国籍管辖的原则

B.领土管辖的原则

C.普遍性管辖

D.保护性管辖

题型:计算题

  People use money to buy food, furniture, books, bicycles and hundreds of other things they need or want. Most of the money today is made of metal or paper. But people used to use all kinds of things as money. One of the first kinds of money was shells. Shells were not the only things used as money. In China, cloth and knives were used. In the Philippine Islands, rice was used as money for a long time. Elephant tusks, monkey tails, and salt were used as money in parts of Africa.

Some animals were used as money too. The first metal coins were made in China. They were round and had a square hole in the center. People strung them together and carried them from place to place. The first coins in England were made of tin (锡). Sweden and Russia used copper (铜) to make their money. Later countries began to make coins of gold and silver.

Later the Chinese thought of a way to improve money. They began to use paper money. Money has had an interesting history from the days of shell money until today.

小题1:People used different kinds of things as          .

A.gold

B.metal

C.money

D.silver小题2:Tin was first made as money in         .

A.China

B.Philippine Islands

C.England

D.Russia小题3: The word "strung" in the passage probably means         ."

A.came

B.tied

C.put

D.made小题4: The best topic of the article is”         .”

A.How Many Kinds of Money Are There in the World

B.The History of Money

C.Money in Different Countries

D.The Use of Money

题型:计算题

肝气犯胃之胃痛可见()

A.胃脘隐痛

B.胃脘刺痛

C.胃脘胀痛

D.胃脘灼痛

题型:计算题

项目总控的手段是应用现代信息技术对信息进行采集和处理,根据信息的状态及映射关系,可分成()

A.目标平面

B.信息平面

C.报告平面

D.组织平面

E.用户平面

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