单项选择题

按结构形式划分,用6根刻痕钢丝和一根光圆中心钢丝捻制的钢绞线的代号为（）。

A.1×6
B.1×7
C.1×7I
D.（1×7）C

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按结构形式划分,用6根刻痕钢丝和一根光圆中心钢丝捻制的钢绞线的代号为（ ）。