Unverified75% confidenceDecision RuleTime unknown
支撑杆顶部若为螺旋升降结构，锁定后需检查是否有防松脱设计（如螺母锁死或棘轮），单纯靠螺纹拧紧的杆在长期振动下会自动松脱下降失效
1
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75%
Confidence
Long-term
Relevance
-
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