单选题The scuppers should be plugged （）.Aonly if fixed containment is not usedBonly if portable containment is not usedConly if fixed containment drains are openDwhenever the vessel is being bunkered
单选题
The scuppers should be plugged （）.
A
only if fixed containment is not used
B
only if portable containment is not used
C
only if fixed containment drains are open
D
whenever the vessel is being bunkered
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