單項(xiàng)選擇題

A.forming temporary eyes in lines
B.joining two lines of equal size
C.keeping line from unlaying or fraying
D.joining two lines of different size

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A.number of strands
B.number of wires in each strand
C.circumference
D.diameter

A.raise the boom
B.raise the hook
C.raise the boom and hook
D.check the boom stop