Unverified88% confidenceDecision RuleTime unknown
家用管道内窥镜镜头直径应小于被检管道内径的1/2，检测DN50（内径约46mm）以下的家用下水管建议选5.5mm或8mm镜头，25mm以下细管需选3.9mm微型镜头
1
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88%
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Long-term
Relevance
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