[主观题]28．一个安全的认证体制应满足哪些要求？
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Directions. In this pat there are four passages. Fach passage is followed by five questions or unfinished statements.For cach of them, there are four choices marked A. B, C and D. You should decide on the best choice and mark thecorresponding ltter on the Answer Sheet with a single linc through the center.Passage 1Most American people hate repeating the same work endlessly, cspecially those who live in West America. Theytry their best to make their life colorful and their work intersting If they have to do the same regular work, theyll tryto do it in diferent ways. Repetition and monotony (单调) are what they can't stand.In the West of America, there is a beauiful old mountain village which is well known for its straw hats. Thewllagers there can make different styles of hats-hats for old gentlemen, for sweet and playful children，and forbeautiful young ladis. People ofien go there to buy hats.One day there came a young tourit who entered a hat shop and found a very nice hat that cost five dollars. Hesaid to the shop-keeper, "If you agree to sell ata cheaper price, rd like to buy two hundred hats of this style." "No, youshould pay me at least ten dllas cach ifyou wish to get so many hats of the same style.""How's thar?" The tourist could not understand."Well," sid the shop-keeper. "Ir you buy only one hat of this style, Ican make in casily. I you order two hundredhats of diferent styles. I can also manage the business without much dificulty. However, it will almost bors me 1odcah if you want me to make two hundred hats of the same style. So at least you pay me double price."
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112. 计算总指数时，在下面哪种情况下可用加权调和平均数指数的形式（ ）。（1分）
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若有一个计算类型的程序，它的输入量只有一个X，其范围是，现从输入的角度考虑一组测试用例：-1.001,-1.0,1.0,1.001.设计这组测试用例的方法是( )
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11．医疗保险的经费主要来源于
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计算机最主要的工作特点是( )。
