单项选择题
A mooring line leading at nearly right angles to the keel is a（）.
A.bow line B.breast line C.spring line D.stern line
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（）.
单项选择题 A look-out should report objects sighted using（）.
单项选择题 A lookout can leave his station（）.
