單項(xiàng)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

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單項(xiàng)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

單項(xiàng)選擇題

A tug in irons is（）.

A.rudder bound
B.being tripped by the towline
C.unable to maneuver
D.broached