单项选择题
The device used for preventing the passage of flames into enclosed spaces is called a （）.
A.flame relief valve B.flame stopper C.safety valve D.flame arrester
单项选择题 Your vessel has run aground and upon taking fuel oil tank soundings, you find that a fuel tank level has increasedYou therefore should suspect （）.
单项选择题 Following a grounding, you can best determine that a SLACK fuel oil tank has been holed by （）.
单项选择题 Bilges may be pumped （）.
