four-stranded sisal line
three-stranded cotton line
sail twine
two-stranded hemp cord
第1题：
increases the lifting capacity of the hook
protects the hook from the sling ring
prevents the sling ring from coming out of the hook
All of the above
第2题：
Mousing a cargo hook with marline or small line ______.
A.increases the lifting capacity of the hook
B.protects the hook from the sling ring
C.prevents the sling ring from coming out of the hook
D.All of the above
第3题：
Serving is ______.
A.marline or ratline wound along the grooves of a rope
B.narrow strips of light canvas or cotton cloth spiral-wrapped along the rope
C.marline tightly wound on the rope by means of a board or mallet
D.a splice made by laying the strand of one rope into the vacated grooves of another rope