A. cutting off the supply of oxygenB. removing the fuel……

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

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

单项选择题Second Officer, give one （）(长声).

A. blast
B. short blast
C. prolonged blast
D. prolonged blasts