单项选择题
A. cutting off the supply of oxygen B. removing the fuel C. spraying with water D. adding oxygen
You will extinguish a fire when you remove （）.A.oxygenB...
单项选择题You will extinguish a fire when you remove （）.
A.oxygen B.carbon dioxide C.H2O D.H2
I’m on fire and have dangerous cargo on board. The most...
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
（）(停顿) for a while when the boat leaves the surface.A.H...
单项选择题（）(停顿) for a while when the boat leaves the surface.
A.Halting B.Halt C.Adjust D.Heave
