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高等继续教育 / 机械制造基础
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材料的冲击韧性之可以用于强度设计,冲击韧性越高强度较高。
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机械制造基础
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10、 有些公司让消费者通过视频信息系统操作一个小型终端,用对讲式闭路电视订购屏幕上显示的商品,这种分销形式属于 A. 直接销售 B. 购货服务 C. 自动售货 D. 直复营销
营销策划
名词解释 参考工具书
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Trees mainly serve man in three important ways: They provide him with wood and other products; they provide him shade; and they help to prevent droughts and floods.Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important.In his eagerness to make money from trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And besides, he is usually too careless to plant and look after new trees. So the forests slowly disappear.This does not only mean that man will have fewer trees. The results are even more serious: for where there are trees, their roots break up soil allowing the rain to sink in and also bind(固定) the soil, thus preventing it from being washed away easily;but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When the top-soil is gone, nothing remains but worthless desert.Two thousand years ago,a rich and powerful country cut down its trees to build warships, with which to gain itself an empire.It set up the empire, but, without its trees, its soil became poor and grew weak. When the empire fell to pieces, the home country found itself faced by floods and starvation(饥荒).In many places forests slowly disappear because _ _ _ _ _ _ _ _ _ _ .
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“φ8@200”没能表达出这种钢筋的( )。
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