单项选择题
A mooring line leading at nearly right angles to the keel is a （）.
A.spring line B.bow line C.stern line D.breast 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 monkey fist is found on a （）.
单项选择题 A mobile offshore drilling unit will show the day-shape in DIAGRAM 10 to indicate that it is （）.
