單項(xiàng)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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1.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

2.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

3.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

4.單項(xiàng)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

5.單項(xiàng)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