MCQOPTIONS
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MCQOPTIONS
| 1. |
_ The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is$? |
| A. | 1 ppm |
| B. | 4 ppm |
| C. | 10 ppm |
| D. | 40 ppm |
| Answer» C. 10 ppm | |