Unverified85% confidenceTradeoffTime unknown
检测拐弯多的S型存水弯或地漏，探杆过硬会卡住，应选半硬式（semi-rigid）鹅颈软管；直管长距离疏通则需硬度更高的探杆以便推送
1
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85%
Confidence
Long-term
Relevance
-
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