 
			 
			MCQOPTIONS
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				| 1. | Which of the following parts is used as exothermic materials or insulators for the increase in efficiency of the riser? | 
| A. | Chills | 
| B. | Feeding aids | 
| C. | Biscuit | 
| D. | Filler | 
| Answer» C. Biscuit | |