单项选择题
The size of wire rope is determined by the（）.
A.number of strands B.number of wires in each strand C.circumference D.diameter
单项选择题 The signal man assisting a crane operator has his arm extended with his fingers closed and thumb pointing upward. This is the signal to（）.
单项选择题 The rope which is the lightest is（）.
单项选择题 The rope which is rove from the truck to be used with a bos’n chair is called a（）.
