单项选择题
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
Second Officer, give one （）(长声).A. blastB. short blastC...
单项选择题Second Officer, give one （）(长声).
A. blast B. short blast C. prolonged blast D. prolonged blasts
