如图所示,电荷量和质量都相同的带正电的粒子以不同的初速度通过A、B两板间的加速电

题型:选择题

问题:

如图所示,电荷量和质量都相同的带正电的粒子以不同的初速度通过A、B两板间的加速电场后飞出,不计重力的作用,则(   )

A.它们通过加速电场所需要的时间相等

B.它们通过加速电场过程中动能的增量相等

C.它们通过加速电场过程中动量的增量相等

D.它们通过加速电场的过程中电势能的减少量相等

考点:带电粒子在电场中的偏转
题型:选择题

阅读理解。

     Any mistake made in the printing of a stamp raises its value to stamp collectors. A mistake on one

inexpensive postage stamp has made the stamp worth a million and a half times its original value. The

mistake was made more than a hundred years ago in the British colony of Mauritius, a small island in

the Indian Ocean. In 1847 an order for stamps was sent to a London printer-Mauritius was to become

the fourth country in the world to issue (发行) stamps.

     Before the order was filled and delivered, a ball was planned at Mauritius' Government House, and

stamps were needed to send out the invitations. A local printer was instructed to copy the design for

the stamps. He accidentally printed the words "Post Office" instead of "Post Paid" on the several hundred

stamps.

     Today there are only twenty-six of these misprinted stamps left fourteen One Penny Orange-Reds and

twelve Two Penny Blues. Because of the Two Penny Blue's rareness and age, collectors have paid as much

as $16,800 for it.

1. Over a century ago, Mauritius _____.

A. was an independent country

B. belonged to India

C. was one of the British colonies

D. was a small island in the Pacific Ocean

2. The mistake on the stamps was made _____.

A. in Mauritius

B. at Mauritius Government House

C. in a post office

D. in London

3. Stamp collectors have paid $16, 800 for _____.

A. fourteen One Penny Orange-Reds

B. twelve Two Penny Blues

C. One Penny Orange-Red

D. one Two Penny Blue

题型:选择题

房地产市场高峰期的主要特征有( )。

A.大批房地产开发项目开工

B.售价以比租金快得多的速度上涨

C.新房换手快,交易量大

D.房屋空置率也经历了在上升期的基础上继续下降到该阶段后期开始上升的过程

E.空置率高于正常水平

题型:选择题

— Your coat is very nice!

— _______.

[      ]

A. No, it isn't

B. Yes, sure

C. Thank you

D. Not very nice

题型:选择题

下列属于无形资产的是( )。

A.建设单位开办费

B.长期待摊投资

C.土地使用权

D.短期待摊投资

题型:选择题

根据下列选项,回答151-152题。

甲是某期货公司客户,某日结算时,甲持仓的期货品种,期货交易所规定的保证金比例是5%,期货公司对甲收取的保证金比例是7%,

按照有关司法解释的规定,下列情形构成透支交易的是()。

A.甲保证金水平为6%,期货公司允许甲继续持仓

B.甲保证金水平为4%,期货公司允许甲开仓交易

C.甲保证金水平为6%,期货公司允许甲开仓交易

D.甲保证金水平为4%,期货公司允许甲继续持仓

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