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.
单项选择题 Second Officer, give one （）(长声).
单项选择题 Where do you post your （）(火势控制图)?
