单选题Regulations require that cargo tanks carrying grades D or E liquids on tank barges be vented with（）.Agooseneck vents and flame screensBpressure-vacuum relief valvesCbranch vent lines and a vent headerDforced draft blowers
单选题
Regulations require that cargo tanks carrying grades D or E liquids on tank barges be vented with（）.
A
gooseneck vents and flame screens
B
pressure-vacuum relief valves
C
branch vent lines and a vent header
D
forced draft blowers
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