A. 价值工程中的价值是指成本与功能的比值
B. 价值工程中的价值是指产品消耗的必要劳动时间
C. 价值工程中的成本是指寿命周期成本，包括产品在寿命期内发生的全部费用
D. 价值工程中的成本就是产品的生产成本，它随着产品功能的增加而提高
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