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【简答题】
某制造商生产的零部件次品率为P，该零部件每150件为一批次。以往的经验表明P=0.05或P=0.25，而且有80%的批次P=0.05，有20%的批次P=0.25。这些零部件被用来装配成整机，零部件的质量可在整机出厂前被检验出来。制造商可以在装配之前先对零部件进行检测，筛掉次品，这样每件要花费10元；也可以不检测而直接使用，但这样每个次品的重制费用为100元。上述成本经计算如表7-4所示。若决定进行检测，则要天时间准备检测仪器和设备，但在决定是否检测之前，可以从一批中抽取一件去检验室做快速，可得知其是否次品。快速的费用是85元。 表7-4 P=0.05 P=0.25 检查 1500 1500 不检查 750 3750 (1)若不考虑快速，制造商的最优决策是什么? (2)制造商为“完全信息”所值得付费的上限是多少? (3)是否应考虑做快速，若经快速结果是次品，制造商的最优决策是什么?
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the loss of the Arctic ice will affect both animals living there and all human beings
B.
the loss of the Arctic ice will make us feel warm in summer and cold in winter
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