单项选择题
---Slow ahead both engines! ---Slow ahead both engines! （）!
A. Both engines slow ahead B. Engine slow ahead port C. Engine slow ahead starboard D. Engine both ahead
单项选择题 ---Slow ahead! ---Slow ahead! （）!
单项选择题 ---Dead slow ahead! ----Dead slow ahead! （）
单项选择题 ---Ring off engine! ---Ring off engine! （）
