MCQOPTIONS
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				| 1. | 
                                    Air bubbles formed on the surface of casting is probably due to________________? | 
                            
| A. | Improper casting pressure | 
| B. | Improper heating of the investment | 
| C. | Improper angulation of sprue | 
| D. | Improper wetting of the wax pattern by the investment | 
| Answer» E. | |