MCQOPTIONS
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				| 1. | 
                                    Chemical tempering in porcelains is done to interrupt crack propagation by______________? | 
                            
| A. | Transformation toughening | 
| B. | Dispersion of crystalline phase | 
| C. | Inducing residual compressive strength | 
| D. | All of the above | 
| Answer» D. All of the above | |