Unverified83% confidenceDecision RuleTime unknown
伸缩杆采用内外双管套接结构,伸得越长则重叠段越短、杠杆力矩越大,中段下垂越明显,故2.5m以上大跨度晾晒应选择带中间支撑或加粗管径(≥25mm)的型号,避免选择伸到极限长度使用
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