单项选择题
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
（）(所有船员) must know the locations as well as the operati...
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
