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凡需求量D、提前订货时间t全部为确定已知的存储问题所构成的存储模型为确定型。
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凡需求量D、提前订货时间t全部为随机变量的存储问题所构成的存储模型为随机型。
文件系统中源程序是有结构的记录式文件。（）
The energy problem is not merely a short-term crisis. Geologists 【1】 that 80 percent of all the oil 【2】 in the US will be used 【3】 before the year 2000. We might even come to the end of our coal reserves, abundant as they are, before another century is over. Americans have been 【4】 this situation suddenly. Many unprepared even to recognize 【5】 , and most of us are unprepared to meet it. We are unprepared 【6】 our habits and traditions, and our national life 【7】 based on a history of material abundance. With about 6 percent of the world’’s 【8】 ,we in the US 【9】 nearly 50 percent of the world’’s energy resources. Such resources within the us 【10】 are still ample by any standards except our own.
物流系统选址是指对物流网络中的关键物流节点的数量、位置、大小进行优化，以实现整个物流系统的效率最大化。
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