单项选择题

A stream of water immediately surrounding a moving vessel’s hull，flowing in the same direction as the vessel is known as（）.

A.directional current
B.forward current
C.propeller current
D.wake current

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Tide is（）in direction ENE.

A.getting
B.setting
C.being
D.having
单项选择题
A structure，usually made of stone，or cement pilings，which extends from the bank at approximately right angles to the current is called a（）.

A.dike
B.revetment
C.cutoff
D.crib
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