单项选择题
Which method of adjusting mooring lines is MOST useful for leaving a boat free to rise and fall with the tide?（）
A.Crossing the spring lines B.Slacking all forward running lines while keeping all after running lines taut C.Doubling up on spring or breast lines D.Slacking bow and stern lines
单项选择题 Which method is used to detect rot in manila lines?（）
单项选择题 Which measure should NOT be taken to reduce the pounding of a vessel in a head sea?（）
单项选择题 Which may ignite fuel vapors?（）
