In the event of a fire, the doors to a stair tower must be closed to prevent the spread of fire by （）.<br>A:convection<br>B:conduction<br>C:radiation<br>D:ventilation

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

出自：海船船员证

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