18) The flow in municipal town water supply pipes is generally
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the correct ans is power supply
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i guess metal, u can find it out in this article
The most common materials for the manufacture of water main pipes and fittings are metal (cast iron, ductile iron, steel, and copper), clay and concrete pipe (vitrified clay, reinforced concrete, and asbestos cement), and plastics (PVCs, HDPE, and fiberglass).
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