单项选择题
A.after the thrust power is zero
B.after the torsion is zero
C.surpass the critical point on the water turbo phase
D.after the speed is zero
单项选择题 According to the Robinson Graph, suddenly astern maneuvering of main engine during navigating will cause（）
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 （）