Unverified75% confidenceDecision RuleTime unknown
承重与耐用看金属架管壁厚度和焊点，主受力铁架壁厚应≥1.5mm，转换机构（铰链/滑轨）是最易损部件，选购时优先确认铰链是否为多轴承金属结构而非塑料件
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