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说明本书所述货运车辆优化调度算法的原理和求解步骤，并绘出求解过程框图。请简要回答以下问题： (1)若有两种车型的车可用，书中提出的模型应怎样修改?在书中所提算法的启发下，试拟定出一套求解的迭代步骤。 (2)你认为将书中提出的模型和算法推广到多目标的情形。
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A.
figure out
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pitched in
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