Regulations require that cargo pumprooms on tank barges (constructed in 1965) carrying grades B or C liquid cargoes have power ventilation systems which can completely change the air in （）.<br>A:1 minute<br>B:3 minutes<br>C:5 minutes<br>D:10 minutes

Regulations require that cargo pumprooms on tank barges (constructed in 1965) carrying grades B or C liquid cargoes have power ventilation systems which can completely change the air in （）.
A:1 minute
B:3 minutes
C:5 minutes
D:10 minutes

出自：海船船员证

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