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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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考题
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考题
单选题Inerting means（）.A
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考题
单选题Regulations require that tank vessels handling grade B liquids shall have their cargo pumps separated from all sources of vapor ignition by（）.A
cofferdamsB
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gas tight bulkheadsD
areas equipped with power ventilation
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