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| Q. |
Which material is used for pipes which conduct waste? |
| A. | stainless steel |
| B. | copper |
| C. | ceramic |
| D. | plastic |
| Answer» C. ceramic | |
| Explanation: various materials are used in the other systems, e.g. cast iron, steel, copper and aluminum. plastic is used for water and air lines, and ceramic for drainage and sewage pipes. | |
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