单项选择题
A.locate the fire
B.determine which type of fire is burning
C.sound the alarm
D.fight the fire
单项选择题 The device used for preventing the passage of flames into enclosed spaces is called a （）.
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 （）.