The scuppers should be plugged （）.
- Aonly if fixed containment is not used
- Bonly if portable containment is not used
- Conly if fixed containment drains are open
- Dwhenever the vessel is being bunkered
问题
The scuppers should be plugged （）.
参考解析：
分类：船舶电气与船舶安全题库
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