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 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 （）.
单项选择题 A mobile offshore drilling unit under tow is approaching a fog bank. When should fog signals be started? （）
