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Cold crushing strength of ordinary fireclay brick is about 950 kg/cm2 . On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as __________ kg/cm2 . | |
A. | 450 [Wrong Answer] |
B. | 250 [Wrong Answer] |
C. | 150 [Wrong Answer] |
D. | 65 [Correct Answer] |