MCQOPTIONS
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				| 1. | 
                                    What is hearth in a furnace? | 
                            
| A. | the electrodes are often called hearth | 
| B. | the walls of the furnace | 
| C. | the bowl shaped bottom of the furnace | 
| D. | the dome shaped roof of the furnace | 
| Answer» D. the dome shaped roof of the furnace | |