单项选择题
A mooring line leading 45°to the keel，used to check forward or astern movement of a vessel，is called a（）.
A.spring line B.warp line C.bow line D.breast line
单项选择题 A look-out should report objects sighted using（）.
单项选择题 A lookout can leave his station（）.
单项选择题 A look-out at the bow sights an object on your port side. How many bell strokes should he sound? （）
