单选题The helm command PORT TWENTY means（）.Achange course twenty degrees to the leftBput the rudder left twenty degreesCput the rudder hard left for the first twenty degrees of swingDput the rudder left twenty degrees and then ease back as the vessel starts swinging
单选题
The helm command PORT TWENTY means（）.
A
change course twenty degrees to the left
B
put the rudder left twenty degrees
C
put the rudder hard left for the first twenty degrees of swing
D
put the rudder left twenty degrees and then ease back as the vessel starts swinging
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