单项选择题
The pilot needs the ship to go forward very slowly. The order should be （）.
A. “Slow ahead” B. “Dead slow ahead” C. “Astern” D. “Dead slow astern”
单项选择题 Stand （）engine !
单项选择题 “Keep （）to the lighthouse”, said the pilot.
单项选择题 （）two seven five!
