單項選擇題
A.the stopping engine suddenly B.the sailing astern and changing direction suddenly C.the sailing from the shallow water area to the deep water area D.the ship’s trim too much
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
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
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