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Q. |
The proportion of lime, silica, alumina and iron oxide in a good Portland cement should be |
A. | 63 : 22 : 6 : 3 |
B. | 62 : 22 : 3 : 6 |
C. | 22 : 63 : 6 : 3 |
D. | 22 : 63 : 3 : 6 |
Answer» A. 63 : 22 : 6 : 3 |
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