单项选择题
When anchoring a small sailing vessel in rough weather，the best anchor line would be composed of（）.
A.chain-wire B.chain-manila C.chain-nylon D.all chain
单项选择题 What is meant by spotting the boom?（）
单项选择题 What is likely to occur when you are surging synthetic mooring lines on the gypsyhead during mooring operations?（）
单项选择题 Two types of anchor shackles which are currently available are（）.
