Unverified80% confidenceDecision RuleTime unknown
管道弯头≥3个或水平段超过5米的家庭,普通伸缩钢丝刷无法到达深处,应要求服务方使用可调长度软轴机(一般可延伸8-15米)加摄像头探查,否则中段油垢仍会残留
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80%
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Long-term
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