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civil engineering building materials
1. When a brick is immersed in water for 24 hours and then dried, if
(A): 10 per cent surface is covered with grey or white deposits, the brick has slight efflorescence
(B): 50 per cent surface is covered with grey or white deposits, the brick has serious efflorescence
(C): All the above.
(D): no grey or white deposits appear on the surface, the brick is free from soluble salts
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