单选题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 （）.A1 minuteB3 minutesC5 minutesD10 minutes
单选题
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
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