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某煤油输送管道设计能力为12t/h，运行温度为25℃，管道完全破裂环境风险事故后果分析时，假定5分钟内输煤油管道上下游阀门自动切断，则煤油泄露事故的源强估算为（ ）。

A.60t
B.24t
C.12t
D.1t
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