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两轴之间的相互位置关系为相错时，两轴之间的传动可选用（）
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（A）Here is your best chance to travel around the UK in 2012: More than 200 B&Bs (bed & breakfast) across England, Scotland, Wales and Northern Ireland are selected to offer you amazing services for your stay at their lowest prices! Don’t miss it. Just collect the vouchers (活动券) in ourB&B Daily printed from 01/04/2012 to 07/04/2012 and book the stays for your travel following the terms and conditions below:●The offer includes a room for the night and a breakfast the next morning.●The offer is of two kinds:￡20 per room, per night, valid (有效的) during stay period of 02/04/2012—31/05/2012 and then again 01/09/2012—31/10/2012；￡35 per room, per night, valid during stay period of 01/06/2012—31/08/2012.●The offer is valid for a basic twin or double room only.●The stay must be booked directly with the chosen B&Bs before 28/04/2012.●Each voucher can only be used by the holder to book one room for one night.●If voucher holders book either the ￡20 or ￡35 per room per night, any additional services such as lunch, evening meal or activities may require an extra charge. But these are not required in order to takeup the offer. Please check directly with your chosen B&Bs to see what extra services are available.●Vouchers must be presented on arrival. If no vouchers are presented, the B&Bs may reserve (保留) the right to charge at full price for every night of stay.●Vouchers may not be used together with any other offer.●The voucher holders must pay for the stay in full at the time of booking. Additional ￡10 may be paid to confirm (确认) the booking and will be returned on arrival.●The B&Bs reserve the right to refuse voucher holders’ bookings for people under the age of 18. By taking up the offer, the voucher holders can choose to （）.
采用结构化设计方法所设计的系统，其模块的主要特点之一是（）
（D）Television will turn 86 years old on September 7, 2013, and it has never looked better. In its youth, television was a piece of furniture with a tiny, round screen showing unclear pictures of low-budget programs. In spite of its shortcomings, it became popular. Between 1950 and 1963, the number of American families with a television jumped from 9% to 92% of the population.As the audience got larger, the technology got better. Television sets became more reliable through the 1960s. Both of the reception and the picture improved. The major networks started broadcasting programs in color.Even greater improvements were coming according to Sanford Brown, who wrote an article for the Post in 1967. Surprisingly, just about every prediction he made in the article became a reality. For example: All sets in the not-distant future will be color instruments. He also predicted that TV sets would become smaller, simpler, more reliable and less expensive and may forever put the TV repairman out of work. Smaller sets do not, of course, mean smaller screens. TV engineers expect screens to get much bigger. However, today’s 3-D TV is even farther away, if it’s coming at all. There is some doubt whether the public would be eager to pay for it, in view of people’s cold reception given to 3-D movies.But the technology with the greatest potential, according to Brown, was cable television (有线电视), which was still in its early stages then. As he predicted, the future of cable television was highly interactive (互动的). It wasn’t cable television that gave Americans their electronic connection to the world, however. It was the Internet. He even foresaw the future office: using picture phones, big-screen televisions for conferences, and computers providing information, at the touch of a button.Brown ever said, “The future of television is no longer a question of what we can invent. It’s a question of what we want.” What can we infer about television sets in the 1960s?（）
在数据字典中有三种类型的信息需要描述：数据流、文件和（）
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