单项选择题

A bluff bar is a bar（）.

A.extending out from a bluff alongside the river
B.that tends to give a false indication of its position
C.that has a sharp drop off into deep water
D.that is perpendicular to the current

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B.hauling parts of two tackles are attached
C.hauling part leads through the movable block
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Limber is a term associated with（）.

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