21.  If A equals 1, B equals 2, C equals 3.

22.  B: As a matter of fact, we want to provide precise computer models for art museums, libraries, maybe even home computers.

23.  B: Besides it is armed with the latest gadgets for advanced computer graphics, it will also use computer-controlled laser scanners to capture the sculpture.

24.  B: That's a good question.

25.  B: Yes, These sculptures are rich treasure.

26.  B: I expect our project to be historically significant.

27.  B: It's my pleasure.

28.  As a result, their "A" average in anthropology drifted to a mediocre "B".

29.  If only colleges had fixed time for lights to go out, if only students had enough self-control, if only accounts were given out on the basis of need, then maybe horror stories about young prospective people who have their "A" drift to a mediocre "B", who have been out of touch with others for a long time, who have got lost in their own world, wouldn't exist.

30.  For example, a for B to provide goods or services, a will have the right to claim compensation for BThe end is Asymmetric information, because of the economic activities in which information is different, some people can take advantage of information fraud, this will damage the legitimate transactions, when the people of fraud concerns seriously affect the trading activities, with normal market action will be lost, the market allocation of resources function or malfunction.