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如何建立合理而经济的数学模型，是其中的关键问题之一。
One of the key problems is to establish reasonable and economic mathematical model.
youdao
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建立了工序质量经济控制数学模型。
Construct the modal of economical control on process quality.
youdao
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建立了工序质量经济控制数学模型。
Construct the modal of economical control on process quality.
youdao