單項選擇題The square knot is used for（）.
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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1.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
2.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
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Galvanizing would be suitable for protecting wire rope which is used for（）.
題型：單項選擇題
If an attempt is made to hoist a load that exceeds the capacity of an electric winch，an overload safety device causes a circuit breaker to cut off the current to the winch motor（）.
題型：單項選擇題
Cribbing is（）.
題型：單項選擇題
Manila lines in which the strands are right-hand laid（）.
題型：單項選擇題
A whipping on a fiber line（）.
題型：單項選擇題