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（）.AcofferdamsBempty cargo spacesCgas tight bulkheadsDareas equipped with power ventilation
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
cofferdams
B
empty cargo spaces
C
gas tight bulkheads
D
areas equipped with power ventilation
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