两段程序都使用递减的计数器生成元素的值。
Both programs decremented a counter to generate the element values.
算例分析表明：最优价格是初始库存的递减函数，是潜在购买率和销售时间段的递增函数；
Simulation shows that the optimal price is a decreasing function of initial inventory and an increasing function of sale period and potential buying probability;
第四段：一般有机台还有第五，第六段，这段的成型速度和压力相同前，都存在两段一个递减过程。其作用都是起到一个再次充满的作用。
Step4 section: Some injection machines have step5, step6 which are same as former molding speed and pressure this step should diminish and inject once more.
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