单项选择题
Before starting to hoist provisions，which should be checked?（）
A.Hoist rope is not kinked
B.Multiple part lines are not twisted around each other
C.The hook is centrally located over the load
D.All of the above
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An advantage of nylon rope over manila rope is that nylon rope（）.
A.can hold a load even when a considerable number of the yarns have been abraded
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D.gives audible warning of overstress whereas manila does not
