单项选择题
A 6x12，two-inch wire rope has（）.
A.12 strands and a two-inch diameter
B.12 strands and a two-inch circumference
C.6 strands and a two-inch diameter
D.6 strands and a two-inch circumference
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A.keep a line from fraying
B.join lines of unequal size
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（）provide athwartship support for the mast or king posts.
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