單項選擇題

A tug may be in danger of tripping when（）.

A.towed sideways by an overwhelming force on the towline
B.her tow moves parallel to and forward on either side of the tug
C.the tow is no longer directly astern but moves up on her quarter
D.All of the above

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單項選擇題

A tug is best positioned for towing and maneuvering on rivers and other restricted waters where wave action is limited when（）.

A.directly astern and pushing the tow
B.towing on a hawser
C.towing alongside and parallel to the vessel it is towing
D.towing on the hip

單項選擇題

A tug is “in irons” when held in a fixed position by（）

A.the weight of its tow，its being anchored，or grounded
B.the weight of its towing hawser on the bottom
C.an adverse current
D.lack of power or an engine breakdown