单项选择题

A.continue to be responsible for the safe navigation of……

Which of the following shall not the officers in charge of the navigational watch do?（）

A.continue to be responsible for the safe navigation of the ship
B.Leave the bridge
C.Keep the watch on the bridge
D.Use any available navigational aids necessary to ensure that the ship follows the planned course

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单项选择题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

单项选择题The circulation around a low pressure center in the Northern Hemisphere is（）.

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

单项选择题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

单项选择题It is dangerous for vessels without the operational radar（）the estuary.

A.to get
B.to approach
C.to proceed
D.to close

单项选择题Bales close to the deckhead should be covered to prevent（）.

A.damage by dripping sweat
B.damage by odor contamination
C.from striking structure
D.from steel rusty