单选题When the vessel on the full speed ahead, if full astern immediately （） the main engine start astern and fuel injection.Aafter the thrust power is zeroBafter the torsion is zeroCsurpass the critical point on the water turbo phaseDafter the speed is zero
单选题
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
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