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
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1.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
2.單項選擇題The rope which is the lightest is（）.
A.manila
B.nylon
C.polypropylene
D.dacron
