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| Q. |
The compressive strength of second elass bricks should bot be less than |
| A. | 7.5 MN/m2 |
| B. | 9 MN/m2 |
| C. | 10.5 MN/m2 |
| D. | 12 MN/m2 |
| Answer» A. 7.5 MN/m2 | |
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