MCQOPTIONS
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| 1. |
For the construction of concrete, the concentration of sulfate anhydride in mixed water should not exceed ______. |
| A. | 2000 ppm |
| B. | 1000 ppm |
| C. | 3000 ppm |
| D. | 4000 ppm |
| Answer» D. 4000 ppm | |