Regulations require that pumprooms on tank vessels carrying grade C liquid cargo with machinery spaces below the freeboard deck be ventilated with（）.<br>A:power ventilation<br>B:gooseneck vents and flame screens<br>C:at least two ducts extending to the weather deck<br>D:a vent header system

Regulations require that pumprooms on tank vessels carrying grade C liquid cargo with machinery spaces below the freeboard deck be ventilated with（）.
A:power ventilation
B:gooseneck vents and flame screens
C:at least two ducts extending to the weather deck
D:a vent header system

出自：海船船员证

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