Unverified80% confidenceDecision RuleTime unknown
伸缩杆的实际稳固长度应控制在最大伸缩长度的70-80%以内，例如标称70-120cm的杆子，实际安装在90-105cm时最稳，接近极限长度时管壁重叠少、抗弯能力骤降
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Unverified免打孔窗帘杆的实际稳固长度应≤最大伸缩长度的80%，例如标称0.6-1.1米的杆子，超过0.9米后弹簧顶撑力会明显衰减，易脱落86% similarUnverified站立操作选总长110-130cm伸缩杆，杆径≥22mm且带内置卡扣锁定，避免用力时缩杆86% similarUnverified伸缩式隔板调节范围一般标注为如「40-70cm」，实际稳定承重区间只在中段，拉到接近最大值时接缝处支撑变弱，选购时预留5cm余量而非顶格使用85% similarUnverified顶天立地式伸缩杆搁架的锁定长度必须留5-10cm余量：标称范围200-300cm的产品，实际稳固区间在210-290cm，接近极限值时管壁咬合变浅极易松脱坠落84% similarUnverified隐藏搁板的悬挑力矩随长度增加而放大，同样承重下60cm搁板比30cm搁板对螺栓的拉拔力大一倍，长度>80cm时建议至少3个固定点且板厚≥30mm，否则中部易下垂83% similar
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