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实现数据库操作的DAO技术，其模型采用的是层次结构，其中处于最顶层的对象是 【12】 。
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对于有效期的表示方法 美国产品大多采用( )
"How are you keeping" "Look (31) yourself. " "Good Health. ""Here’s your health." "Health, wealth and happiness." "If you’re healthy, you’re (32) "It’s amazing how many greetings, wishes and general expressions turn on health. Health is something healthy people hardly ever think about (33) they’re (34) When that happens they think about little else. Then their visits to the doctor, the hospital; if they’re really unwell, medicines, pills, bottles, ointments, injections, having their temperature taken, and the worry (35) expense. Well, (36) least in Britain the last part isn’t too bad under the National Health Service. This is a Government enforced scheme whereby everyone pays in a small percentage of their earnings each week (37) month, and is then entitled to free medical treatment when they are ill. This doesn’t include medicines, which have to be paid (38) , but at a considerably reduced rate.Everybody (39) Britain is advised (40) have a local doctor. When a person moves (41) a district, one of the first things they do is to find a (42) doctor and get on his list or panel. There (43) lists of NHS doctors in the local post offices and everybody has a (44) card. Most British (45) are already registered with a doctor and moving into a new district entails no more than finding a new doctor and transferring (46) his panel.The National Health doctor will treat, and prescribe for, the more usual illnesses. Any cases that are beyond the scope of the local surgery he will (47) to the nearest hospital, Again, in hospital, the (48) is free. The only drawback is that a great many people are in, or attending, hospital (49) that most would-be patients have to go on a waiting list before they can (50) hospital treatment. 37().
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