给定关系r(R)，r满足(44)函数依赖。

①A→B
②A→C
③AB→C
④C→A
⑤BC→A
⑥AC→B
A．1、2、3
B．2、3、4、5
C．3、4、5、6
D．1、2、3、6

未分类题根据竞争程度的不同,将市场结构分为( )。

未分类题Most of us trade money for entertainment. Movies, concerts and shows are enjoyable but expensive. (78) If you think that you can't have a good time without spending a lot of money, read on. A little resourcefulness and a few minutes of newspaper- scanning should give you some pleasant surprises. People may be the most interesting show in a large city. Stroll through busy streets and see what everybody else is doing. (79) You will probably see people from all over the world; you will certainly see people of every age, size, and shape, and you' II get a free fashion show, too. Window - shopping is also a safe sport -- if the stores are closed. Check the listings in your neighborhood paper. Local colleges or schools often welcome the public to hear an interesting speaker or a good debate. The film or concert series at the local public library probably won't cost you a penny. Be sure to check commercial advertisements too. A flea market can provide hours of pleasant browsing. Perhaps you can find a free cooking or crafts demonstration in a department store. Plan ahead for some activities. It is always more pleasant not to have people in front of you in a museum or at a zoo. You may save some money, too, since these places often set aside one or two free admission days at slow times during the week. Pretend that you are a tourist from time to time, and get to know your city all over again including the indispensable sights that people travel miles to see. If you feel like taking an interesting walk, find a free walking tour, or plan one yourself. You will see your city in a new perspective once you know more about its history or its architectural treasures. With imagination and a spirit of adventure you can quite easily find good entertainment at no cost at all.Which of the following statements is NOT true?A．There are many kinds of amusements you can enjoy with spending no money.B．The film shown at the local public library is often free of charge.C．Local colleges often hold meetings to debate the issues people are interested in.D．You should be a tourist if you want to know more about the city you live in.

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单项选择题交换的效率意味着( )。 A．获得了个人能从交换中获得的所有好处 B．厂商必须最小化其成本 C．不可能在生产更多的某些产品的同时不减少其他产品的产量 D．经济必须处于生产可能性曲线上

未分类题经营者违法经营,从事不正当竞争行为,并给他人造成经济损失,根据《反不正当竞争法》的规定( )确定其赔偿责任。