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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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