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| Q. |
The surface finish obtainable in ultrasonic machining is of the order of |
| A. | 500 to 1000 |
| B. | 0.2 to 0.5 |
| C. | 200 to 500 |
| D. | 20 to 50 |
| E. | 2 to 5 |
| Answer» B. 0.2 to 0.5 | |
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