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| Q. |
The sum of the percentage of tricalcium silicate and dicalcium silicate for Portland cement varies from |
| A. | 50 to 60% |
| B. | 60 to 70% |
| C. | 70 to 80% |
| D. | 80 to 90% |
| Answer» C. 70 to 80% | |
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