單項選擇題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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1.單項選擇題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

2.單項選擇題Towlines should be inspected for chafing where the towline（）.

A.passes over the stern of the towing vessel
B.passes through chocks
C.is attached to the disabled vessel
D.All of the above

3.單項選擇題The strongest of the natural fibers is（）.

A.cotton
B.hemp
C.manila
D.sisal

4.單項選擇題The spray of water in low-velocity fog will have（）.

A.greater range than high-velocity fog
B.lesser range than high-velocity fog
C.about the same range as high-velocity fog
D.greater range than a solid stream

5.單項選擇題The splice designed to pass easily through a block is called a(n)（）.

A.eye splice
B.short splice
C.long splice
D.block splice