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>


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