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
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（）.
单项选择题 A towing vessel’s fire detection system may be certified to comply with the Coast Guard’s towing vessel fire protection regulations by（）.
