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


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1.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

2.單項選擇題A tug in irons is（）.

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

3.單項選擇題A tsunami is caused by a(n)（）.

A.tidal wave
B.storm surge caused by a hurricane or tropical storm
C.earthquake on the ocean's floor
D.tornado

4.單項選擇題A traffic separation zone is that part of a traffic separation scheme which（）.

A.is located between the scheme and the nearest land
B.separates traffic proceeding in one direction from traffic proceeding in the opposite direction
C.is designated as an anchorage area
D.contains all the traffic moving in the same direction

5.單項選擇題A towline should be fastened to（）.

A.the chocks at the bow of a towed vessel
B.the most forward，centermost point of a towed vessel such as a sturdy bow rail
C.the mast of a towed sailboat
D.a secure fitting near the bow of the towed vessel