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Building Materials - Section 2 :: Discussion
| 28. | For the manufacture of Portland cement, the proportions of raw materials used, are | |
| A. | lime 63% ; silica 22% ; other ingredients 15% | |
| B. | lime 22% ; silica 63% ; other ingredients 15% | |
| C. | silica 40% ; lime 40% ; other ingredients 20% | |
| D. | silica 70% ; lime 20% ; other ingredients 10%. | |
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