单项选择题
You will extinguish a fire when you remove （）.
A.oxygen
B.carbon dioxide
C.H2O
D.H2
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相关考题
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单项选择题
I’m on fire and have dangerous cargo on board. The most urgent assistance (最紧急的援助)in this case would be（） .
A.lifeboat
B.medicine
C.firefighting
D.lifesaving -
单项选择题
（）(停顿) for a while when the boat leaves the surface.
A.Halting
B.Halt
C.Adjust
D.Heave -
单项选择题
（）(所有船员) must know the locations as well as the operations of the life-saving and fire-fighting appliances.
A. All officers
B. All engineers
C. All the crew
D. AB and C
