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| Q. |
The rate of accumulation of sludge in septic tanks is recommended as |
| A. | 30 litres/person/year |
| B. | 25 litres/person/year |
| C. | 30 litres/person/month |
| D. | 25 litres/person/month |
| Answer» A. 30 litres/person/year | |
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