单项选择题
---Slow ahead! ---Slow ahead! （）!
A. Engine ahead slow! B. Engine slow ahead! C. Ahead engine slow! D. Yes, sir
A. Engine dead slow ahead! B. Engine dead ahead slow! C. Engine slow dead ahead! D. I do it right now
A. Finished with engine! B. Engine rung off! C. Engine stand by! D. Got it.