單項選擇題A 6x12，two-inch wire rope has（）.

A.12 strands and a two-inch diameter
B.12 strands and a two-inch circumference
C.6 strands and a two-inch diameter
D.6 strands and a two-inch circumference


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1.單項選擇題Back-up wires on a towed vessel provide（）.

A.a factor of safety
B.additional strength
C.a distribution of the towing load
D.All of the above

2.單項選擇題The square knot is used for（）.

A.forming temporary eyes in lines
B.joining two lines of equal size
C.keeping line from unlaying or fraying
D.joining two lines of different size

3.單項選擇題The size of wire rope is determined by the（）.

A.number of strands
B.number of wires in each strand
C.circumference
D.diameter

5.單項選擇題A whipping is（）.

A.a messenger
B.a stopper for nylon line
C.a U-bolt for securing a cargo whip to the winch drum
D.turns of twine around a rope end

6.單項選擇題In moderate wind and current what should be the length of chain with a single anchor?（）

A.5 times the depth of the water in good holding ground
B.10 times the depth of the water in shallow water
C.2 times the depth of the water in poor holding ground
D.8 times the depth of the water in deep water

7.單項選擇題The rope which is the lightest is（）.

A.manila
B.nylon
C.polypropylene
D.dacron

8.單項選擇題The signal man assisting a crane operator has his arm extended with his fingers closed and thumb pointing upward. This is the signal to（）.

A.raise the boom
B.raise the hook
C.raise the boom and hook
D.check the boom stop

9.單項選擇題Manila slings should not be used to load（）.

A.cotton
B.lumber
C.steel
D.tires

10.單項選擇題Chafing gear is used to（）.

A.anchor the boat
B.pick up heavy loads
C.protect fiber rope from abrasion
D.strengthen mooring lines