When the vessel on the full speed ahead, if full astern immediately （） the main engine start astern and fuel injection.<br>A:after the thrust power is zero<br>B:after the torsion is zero<br>C:surpass the critical point on the water turbo phase<br>D:after the speed is zero

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

出自：海船船员证

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