The scuppers should be plugged （）.<br>A:only if fixed containment is not used<br>B:only if portable containment is not used<br>C:only if fixed containment drains are open<br>D:whenever the vessel is being bunkered

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

出自：海船船员证

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