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题目内容
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In which industries would you tend to see dual facility types (some facilities focusing on only one type of product and others able to produce a wide variety)？ In which industries would this be relatively rare？ Why？
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第6题
A、helping readers to get flavor or taste
B、making readers to become educated
C、setting up communication between reader and author
D、making readers get more pleasure and profit
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为来自X的简单随机样本，则未知参数
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