A traffic separation zone is that part of a traffic separation scheme which（）.

A swift current occurring in a narrow passage connecting two large bodies of water，which is produced by the continuously changing difference in height of tide at the two ends of the passage，is called a（）.

A tug is best positioned for towing and maneuvering on rivers and other restricted waters where wave action is limited when（）.

A strong，often violent，northerly wind occurring on the Pacific coast of Mexico，particularly during the colder months，is called（）.

A tow can override its tug as a result of（）.

A storm’s track is characterized by all of the following except（）.

A tug is “in irons” when held in a fixed position by（）

A sufficient amount of chain must be veered when anchoring a vessel to ensure（）.

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

A stage should only be rigged（）.