在光滑绝缘水平面上，一轻绳拉着一个带电小球绕O点在匀强磁场中做逆时针方向的水平匀

发布时间：2017-06-13 16:19 │ 来源：www.tikuol.com

题型：不定项选择

问题：

在光滑绝缘水平面上，一轻绳拉着一个带电小球绕O点在匀强磁场中做逆时针方向的水平匀速圆周运动，磁场方向竖直向下，其俯视图如图所示。若小球运动到A点时，绳子突然断开，关于小球在绳断开后可能的运动情况，以下说法中正确的是

[ ]

A．小球仍做逆时针匀速圆周运动，半径不变

B．小球仍做逆时针匀速圆周运动，半径减小

C．小球做顺时针匀速圆周运动，半径不变

D．小球做顺时针匀速圆周运动，半径减小

考点：带电粒子在匀强磁场中的运动

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完形填空。

     Nowadays, computers are becoming more and more    1 in many cities and towns. A lot of small
shops and restaurants along busy streets change into    2   game houses. These places are always crowded
with    3   , especially (尤其) young boys.
     In the computer game houses, people    4   a lot of money playing computer games. It's    5   for one
to win against a computer, but one can try it again and again. People have a kind of gambling psychology
(赌博心理) when they play computer games. The more they    6   , the more they want to win, and at last
they even can't live without it. For school boys, they have no    7    in their lessons. When class is over,
they rush to the nearby computer game houses. Some of them can get enough    8    from their parents.
But some of them are not    9   to get money. They begin to steal (偷)    10   students' money and become
thieves (贼).

(    )1.A.beautiful
(    )2.A.book
(    )3.A.people
(   )4.A.take
(   )5.A.easy
( )6.A.miss
( )7.A.interest
( )8.A.book
(    )9.A.bad
(    )10.A.other

B.interesting
B.toy
B.boys
B.win
B.hard
B.lose
B.interesting
B.time
B.angry
B.others

C.carefully
C.computer
C.women
C.use
C.important
C.play
C.interested
C.food
C.difficult
C.another

D.popular
D.sports
D.girls
D.spend
D.wonderful
D.make
D.to interest
D.money
D.easy
D.the others

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A．财政体制管理关系

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C．财政程序管理关系

D．财政平衡管理关系

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