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
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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 -
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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
