当实际成本小于标准成本，其节约数额为有利差异，一般用负数表示。
As the actual cost is smaller than the standard cost, it saves number as the favorable difference, generally express with the negative number.
从产品的角度将客户价值主张分为罗列全部优点、宣传有利差异点和突出共鸣点。
From production view, value proposition could be classified as all benefits, favorable points of difference, and resonating focus.
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