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單項選擇題

A vessel is（）when she is not at anchor，made fast to the shore，or aground.

A.underway
B.making way
C.dead in the water
D.a power driven vessel

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單項選擇題

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

單項選擇題

A spherical buoy may be（）.

A.numbered
B.lettered
C.green
D.red