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单选题
A six-strand composite rope made up of alternate fiber and wire strands around a fiber core is called（）.
A
Spring lay
B
Lang lay
C
Cable lay
D
Alternate lay
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单选题A natural fiber rope can be ruined by dampness because it may （）.A
rotB
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单选题What is an advantage of having wire rope with a fiber core over that of a wire rope of the same size with a wire core（）.A
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单选题The drowning boy made a _____ attempt to catch the rope thrown to him.A
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desperate
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lang layC
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单选题A fiber rope can be ruined by dampness because it may（）.A
rotB
shrinkC
stretchD
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