单项选择题
A.Their yellow book B.Their seaman's book C.Their Pilotage form D.Their bill of health
A.A hard hat B.A long sleeve shirt C.Gloves D.Goggles
A.One shot of chain for every ten feet of water B.One shot of chain for every fifteen feet of water C.One shot of chain for every thirty feet of water D.One shot of chain for every ninety feet of water