经证明，生产调度问题是NP完全问题。
Production scheduling problem has been shown to be a NP complete problem.
研究了某工厂生产调度问题，建立了数学模型。
Having researched the production schedule of the factory, the mathematical model has been built.
研究了某工厂生产调度问题，建立了数学模型。
Having researched the production schedule of the factory, the mathematical model has been built.
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