MCQOPTIONS
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| 1. |
Harmless concentration of flouride in drinking water is __ |
| A. | 1.0 ppm |
| B. | less on 0.7 ppm |
| C. | greater on 1.2 ppm |
| D. | 1.5 ppm |
| Answer» C. greater on 1.2 ppm | |