单项选择题
Which will cause a wire rope to fail（）.
A.Using a medium graphite grease as a lubricant
B.Operating a winch too slow
C.Using a sheave with an undersized throat
D.A sheave diameter of 24 times the wire's diameter
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Which tackle arrangement has the LEAST mechanical advantage（）.
A.Single whip
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B.A line led aft from the bow
C.A line led in the same direction as the keel
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