单项选择题
Two mooring lines may be placed on the same bollard and either one cast off first if（）.
A.the eye of the second line is dipped
B.the mooring lines are doubled
C.the bollard has two horns
D.one of the lines is a breast line
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Tugs sometimes shackle a length of chain in the towline in order to（）.
A.take the wear should the towline drag bottom
B.assure that if the towline is overstressed it will part close to the bridle
C.prevent the towline from whipping should it part
D.put spring in the towline -
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Towlines should be inspected for chafing where the towline（）.
A.passes over the stern of the towing vessel
B.passes through chocks
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The strongest of the natural fibers is（）.
A.cotton
B.hemp
C.manila
D.sisal
