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
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What is meant by spotting the boom?（）
A.Lowering it into a cradle
B.Placing it in a desired position
C.Spotting it with wash primer and red lead
D.Two-blocking it -
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What is likely to occur when you are surging synthetic mooring lines on the gypsyhead during mooring operations?（）
A.The lines may jam and then jump off the gypsyhead
B.If there is sudden strain on the line，the man tending the line may be pulled into the gypsyhead
C.The lines' surging may cause the vessel to surge
D.The heat generated may cause the lines to temporarily fuse to the gypsyhead -
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Two types of anchor shackles which are currently available are（）.
A.U-Type and posilok shackles
B.C-Type and wedge shackles
C.D-Type and bow shackles
D.wedge and kenter shackles
