During a fire drill on a vessel, what action is required？（）

单项选择题（）are used for lifesaving .

A. Life-jacket and lifebuoy
B. Freeboard
C. Telemeter
D. Draft

单项选择题Oil fires are best extinguished by （）.

A. cutting off the supply of oxygen
B. removing the fuel
C. spraying with water
D. adding oxygen

单项选择题You will extinguish a fire when you remove （）.

A.oxygen
B.carbon dioxide
C.H₂O
D.H₂

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