单项选择题
A preventer guy（）.
A.prevents anyone from working the cargo at unauthorized times B.is a safety measure in case one of the outboard guys parts C.is a longshoreman who watches for accidents D.is the same as a blacksmith
单项选择题 A piece of small stuff (small line) secured to an object to prevent it from going adrift is a（）.
单项选择题 A new coil of nylon line should be opened by（）.
单项选择题 A mooring buoy，if lighted，shows which color light?（）
