[KongchangAI]
Unverified50% confidenceDecision RuleTime unknown

硬质地面(压实土/碎石地)优先选7075航空铝合金或钢钉,长度18-25cm;铝合金易弯折的选7075而非6061,7075抗拉强度可达500MPa以上,是6061的近两倍

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