單項(xiàng)選擇題

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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單項(xiàng)選擇題

The circulation around a low pressure center in the Northern Hemisphere is（）.

A.counterclockwise
B.variable
C.clockwise
D.anticyclonic

單項(xiàng)選擇題

How long are you prohibited to consume alcohol prior to serving as a member of a watch?（）

A.within two hours
B.within three hours
C.within four hours
D.within five hours