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[单选题]
下图标出了某产品从产地Vs到销地Vt的运输网，箭线上的数字表示这条运输线的最大通过能力（流量）（单位：万吨/小时）。产品经过该运输网从Vs到Vt的最大运输能力可以达到（ ）万吨/小时。
A
5
B
6
C
7
D
8
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试题答案：
A
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