單項選擇題

A strong back refers to a（）.

A.bar securing a cargo port
B.centerline vertical bulkhead
C.deep beam
D.spanner stay

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單項選擇題

A stretch where the channel changes from one side of theriver to the other is called a（）.

A.crossing
B.transit
C.transfer
D.passing

單項選擇題

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