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				| 1. | What is the dry compression strength of core sand mixture for general purpose? | 
| A. | 50 kg/cm2 | 
| B. | 60 kg/cm2 | 
| C. | 70 kg/cm2 | 
| D. | 80 kg/cm2 | 
| Answer» D. 80 kg/cm2 | |