单项选择题
A.two tucks with whole strands and one tuck with one-half strand
B.three tucks with whole strands and two tucks with 1/2 the wire cut from the tucking strand
C.three tucks with whole strands
D.two tucks with whole strands and three tucks with half strands
单项选择题 Is it safe（）a rocket?
单项选择题 Instead of whipping an end of a line，a temporary means of preventing the line from unraveling is to tie a（）.
单项选择题 In the manufacture of wire rope，if the wires are shaped to conform to the curvature of the finished rope before they are laid up，the rope is called（）.