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数据字典是对数据流中数据定义信息的集合，它具有的条目：数据项、数据流、 【11】 和加工。
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除“双重出售”以外，新闻产品的商品性还表现出哪些特点
在测试阶段没有发现的错误，会在软件投入实际运行后逐渐暴露出来。对这类错误的测试、诊断、纠错以及回归测试过程，称为 【7】 维护。
J．Martin认为，企业的数据应是相对稳定的，即 【20】 要相对稳定。
Text 1 Health food is a general term applied to all kinds of foods that are considered more healthful than the types of foods widely sold in supermarkets. For example, whole grains, fried beans, and com oil are health foods. A narrower classification of health food is natural food. This term is used to distinguish between types of the same food. Raw honey is a natural sweetener, whereas refined sugar is not. Fresh fruit is a natural food, but canned fruit, with sugars and other additives, is not. The most precise term of all and the narrowest classification within health foods is organic food, used to describe food that has been grown on a particular kind of farm. Fruit and vegetables that are grown in gardens, that are sprayed only with organic fertilizers, that are not sprayed with poisonous insecticides, and that are not refined after harvest, are organic foods. Meat, fish, dairy and poultry products from animals that are fed only organically grown feed and that are not injected with hormones are organic foods. In choosing the type of food you eat, then, you have basically two choices: inorganic, processed foods, or organic, unprocessed foods. A wise decision should include investigation of the allegations that processed foods contain chemicals, some of which are proven to be toxic, and that vitamin content is greatly reduced in processed foods. Bread is typically used by health food advocates as an example of a processed food. First, the seeds from which the grain is sprayed with a number of very toxic insecticides. After the grain has been made into flour, it is made white with another chemical which is also toxic. Next a dough conditioner is added, along with a softener. The conditioner and softener are poisons, and in fact the softener has sickened and killed experimental animals. A very toxic anti-fungal compound, is added to keep the bread from getting moldy. Other foods from the supermarket would show a similar pattern of processing and preserving. You see we buy our good on the basis of smell, color, and texture, instead of vitamin content, and manufacturers give us what we want, even if it is poisonous. The alternative Eat health foods, preferable the organic variety. What do all of the addictives in bread have in common
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