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问题 填空题

一个四位数□56□，要使它能同时被3和5整除，这个数最小是______，最大是______．

答案

能被5整除的数个位只能是0或5，先在个位上填上0或5；

能被3整除的数各个数位上的数的和必须是3的倍数，

百位、十位、个位上的数字和已经为：5+6+0=11或5+6+5=16，

所以要使此数最小，个位上的数字为0，千位上的数字为1即可，

要使此数最大，个位上的数字为5，千位上的数字为8即可；

即最小数是1560，最大数是8565．

故答案为：1560，8565．

单项选择题

工作压力为1.2MPа，DN150法兰密封面与管道中心线的垂直度的允许偏差为（）mm。

A.±1

B.±2

C.±3
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问答题

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(47) I’m still very worried about the impact of violent video games, even though researchers say their impact is moderated by the fact that players don’t so much experience the game as enjoy the technical maneuvers that enable you to win. But in respect of violence in mainstream films, I’m more optimistic. Quite suddenly, tastes have changed, and it’s no longer Stallone or Schwarzenegger who are the top stars, but Leonardo Di Caprio--that has taken everybody by surprise.
(48) Go through the most successful films in Europe and America now and you will find virtually none that are violent. Quentin Tarantino didn’t usher in a new, violent generation, and films are becoming much more pre-social than one would have expected.
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It will become increasingly cheap to make films, with cameras becoming smaller and lighter but remaining very precise. (50) That means greater chances for new talent to emerge, as it will be much easier to learn how to be a better film-maker. Careers will be shorter in the future, and once retired, people will spend a lot of time learning to do things that amuse them--like making videos. Fifty years on we could well be media-saturated as both producers and audiences: instead of writing letters, one will send little home movies entitled My Week.
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