选择题:拉线塔由下列哪种类型的主材构成?()

题目内容:
A、直径较小的多节钢管

B、直径较大的多节圆形或规则多边形钢管

C、直径较大的规则多边形钢管

D、型钢组合成的钢结构立柱




参考答案:

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