成本造价

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1.

The minimal objective function which included system cost, maintenance and repair costs and loss expectation was established .

构建以系统成本造价、维护维修费用和失效损失期望之和为最小的目标函数。

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2.

The utility model changing waste into valuables has the advantages of low cost and high thermal efficiency .

本实用新型变废为宝，成本造价低，热效率高，适合城乡推广应用。