單項(xiàng)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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1.單項(xiàng)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

2.單項(xiàng)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

3.單項(xiàng)選擇題A situation has occurred where it becomes necessary for you to be towed. What action should be taken to prevent your vessel from yawing?（）.

A.Shift weight to the bow
B.Shift weight to the center of the boat
C.Shift weight to the stern
D.Throw excess weight overboard

5.單項(xiàng)選擇題A flashing red light displayed at a single lock means that the lock（）.

A.is ready to use but vessels must stand clear
B.is ready to use and vessels may approach
C.cannot be made ready immediately and vessels shall stand clear
D.cannot be made ready immediately but vessels may approach