问题
问答题 简答题
为什么压力容器要“使用应力高从严，使用应力低从宽”？
答案
参考答案：
因为设计容器时，一般都有较大的安全储备，例如设计压力，设计温度一般都高于实际操作情况，实际的壁厚也往往高于计算壁厚，使得容器在较低的应力水平下工作，其潜在的危险性较小。
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为什么压力容器要“使用应力高从严，使用应力低从宽”？
参考答案：
因为设计容器时，一般都有较大的安全储备，例如设计压力，设计温度一般都高于实际操作情况，实际的壁厚也往往高于计算壁厚，使得容器在较低的应力水平下工作，其潜在的危险性较小。
Scientists have learned a lot about the kinds of food people need. They say that there are several kinds of food that people should eat every day. They are: (1) green and yellow vegetables of all kinds; (2)citrus （柑橘）fruits and tomatoes; (3) potatoes and other fruits and vegetables ; (4) meat of all kinds, fish and eggs; (5) milk and foods made from milk; (6) bread or cereal (谷物), rice is also in this kind of foods; (7) Butter or something like butter. People in different countries and different places of the world eat different kinds of things. Foods are cooked and eaten in many different kinds of ways. People in different countries eat at different times of the day. In some places people eat once or twice a day; in other countries people eat three or four times a day. Scientists say that none of the differences is really important. It doesn’t matter whether foods are eaten raw or cooked, canned or frozen. It doesn’t matter if a person eats dinner at 4 o’clock in the afternoon or at eleven o’clock at night. The important thing is what you eat every day. There are two problems, then, in feeding the large number of people on earth. The first thin g is to find some ways to feed the world’s population so that no one is hungry. The second is to make sure that people everywhere have the right kind of food to make them grow to be strong and healthy. 小题1: According to the scientists, which of the following groups of food is the healthiest for your lunch?
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