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單項(xiàng)選擇題

A rope ladder with wooden rungs is a（）.

A.drop ladder
B.life ladder
C.Jacob's ladder
D.jury ladder

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單項(xiàng)選擇題

A pelican hook（）.

A.Can be released while under strain
B.Is used for boat falls
C.Is used for extra heavy loads
D.Is used for light loads only

單項(xiàng)選擇題

A common class of wire rope is the 6X37 class.What does the 37 represent（）.

A.Number of wires in the inner core
B.Number of strands per wire rope
C.Tensile strength of the wire
D.Number of wires per strand