某石油管理公司拥有下图所示的输油管道网。其中有6个站点，标记为①～⑥。站点①是唯一的供油站。各站点之间的箭线表示输油管道和流向。箭线边上标注的数字表示该管道的最大流量（单位：百吨／小时）。据此可算出，从站点①到达站点⑥的最大流量为（ ）百吨/小时，而且当管道（ ）关闭维修时管道网仍可按该最大流量值向站点⑥供油。
问题1选项
A.14
B.15
C.16
D.18
问题2选项
A.②→③
B.②→⑤
C.③→④
D.⑤→④
正确答案及解析
正确答案
解析
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