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
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A tug in irons is（）.
A.rudder bound
B.being tripped by the towline
C.unable to maneuver
D.broached -
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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 -
单项选择题
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
