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

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

出自：海船船员证

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