单项选择题
A device used to tighten up remaining slack in wire rope when you are making up to a tow in inland waters is a（）.
A.tripping line B.tripping bracket C.norman pin D.steamboat ratchet
单项选择题 A bridle for an ocean tow consists of（）.
单项选择题 A bollard is found on the（）.
单项选择题 A “stopper” is（）.
