当以物体、能量或信息等作为流量流过网络时，怎样使流过网络的流量最大，或者使流过网络的流量的费用或时间最小，这样的流量模型问题，称之为________。-湖北继续教育网网校

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[填空题]当以物体、能量或信息等作为流量流过网络时，怎样使流过网络的流量最大，或者使流过网络的流量的费用或时间最小，这样的流量模型问题，称之为________。

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