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1. |
For a good building stone how much is the required crushing strength? |
A. | Less than 50 N/mm<sup>2</sup> |
B. | Greater than 100 N/mm<sup>2</sup> |
C. | 155 N/mm<sup>2</sup> |
D. | 10 N/mm<sup>2</sup> |
Answer» C. 155 N/mm<sup>2</sup> | |