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)（）.
单项选择题 A traffic separation zone is that part of a traffic separation scheme which（）.
单项选择题 A towline should be fastened to（）.
