單項選擇題

Is it safe（）a rocket?

A.to shoot
B.to fire
C.to let go
D.to send to sky

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單項選擇題

Instead of whipping an end of a line，a temporary means of preventing the line from unraveling is to tie a（）.

A.becket bend
B.blackwall hitch
C.figure-eight knot
D.square knot

單項選擇題

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（）.

A.composite
B.left-lay
C.improved
D.preformed