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

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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

單項(xiàng)選擇題

It is dangerous for vessels without the operational radar（）the estuary.

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

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