1.

The minimum cube strength of concrete used for a prestressed member, is ________

A. 50 kg/cm<sup>2</sup>
B. 150 kg/cm<sup>2</sup>
C. 350 kg/cm<sup>2</sup>
D. 100 kg/cm<sup>2</sup>
Answer» D. 100 kg/cm<sup>2</sup>


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