单项选择题

In the event of a fire, the doors to a stair tower must be closed to prevent the spread of fire by （）.

A.convection
B.conduction
C.radiation
D.ventilation

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单项选择题A vessel sailing through the specific special areas may discharge or dispose of （）.

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船舶电气与船舶安全

In the event of a fire, the doors to a stair tower must be closed to prevent the spread of fire by （）.