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| Q. |
Which of the following statement is correct? |
| A. | The pumping system is the best system of water distribution. |
| B. | A sluice valve prevents water to flow back in the opposite direction |
| C. | In a ring system, there is one main supply pipe. |
| D. | all of the above |
| Answer» C. In a ring system, there is one main supply pipe. | |
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