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| Q. |
Sparks occur between which of the following components? |
| A. | work piece and sheet metal |
| B. | tool electrode and sheet metal |
| C. | work piece and electrode |
| D. | none of the mentioned |
| Answer» B. tool electrode and sheet metal | |
| Explanation: sparks occur between sheet metal and tool electrode for macining insulating ceramics. | |
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