单项选择题

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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单项选择题

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

单项选择题

A tug in irons is（）.

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

单项选择题

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