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單項(xiàng)選擇題

A tow that is properly aligned to pass through a narrow opening between two bridge piers is “ （）”.

A.on course
B.headed fair
C.holding on
D.in shape

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單項(xiàng)選擇題

A tow of 9 barges is made up three abreast by three long. The towboat is faced up to the last barge of the center string. The outer two strings of barges are the（）.

A.port and starboard strings
B.outer strings
C.drag strings
D.side strings

單項(xiàng)選擇題

A tow can override its tug as a result of（）.

A.a mechanical breakdown on the tug
B.adverse tidal current conditions
C.the tug reducing its speed
D.All of the above

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