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The outlet pipe in the septic tank is kept about _________ lower than the inlet pipe.(a) 5 cm(b) 10 cm(c) 15 cm(d) 30 cmThe question was asked at a job interview.I want to ask this question from Systems of Plumbing in chapter Plumbing for Buildings of Construction & Building Materials |
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Answer» The correct choice is (C) 15 CM |
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