A.counterclockwiseB.variableC.clockwiseD.anticyclonicTh……

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

单项选择题The force resulting from the earth’s rotation that causes winds to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere is called（）.

A.pressure gradient
B.Coriolis effect
C.aurora borealis
D.ballistic deflection

单项选择题When steering by autopilot,how often should the steering be checked?（）

A.12 times on each watch
B.When time allows
C.At least once a watch
D.No checking is necessary