Unverified85% confidenceDecision RuleTime unknown
钢管壁厚≥2mm、方管（50x50mm或以上）比圆管抗扭性更好，主承重立柱应为方管；壁厚不足1.5mm的圆管在大重量下会晃动变形
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85%
Confidence
Long-term
Relevance
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