单选

When the vessel on the full speed ahead, if full astern immediately ____ the main engine start astern and fuel injection.

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

试题出自试卷《轮机部三管轮考试题2(轮机英语)》

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