单项选择题
A.rapid reduction of ship’s friction force
B.shaft system over mechanical load
C.sharp growth of the torque of diesel engine
D.propeller torque change along J=0 curve
单项选择题 While a ship with twin screw is making a turn, in order to prevent overload, the duty engineer should （）
单项选择题 If anything abnormal be found on the load change of main engine when the ship is entering in shallow waterway, before taking measuring the engineer on duty should （）
单项选择题 Generally, runaway means such situation when the speed main engine exceeds the rating speed by its （）