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| Q. |
Which method mentioned below is used for drilling of large size holes? |
| A. | direct drilling |
| B. | drill and ream |
| C. | trepanning |
| D. | all of the mentioned |
| Answer» C. trepanning | |
| Explanation: trepanning method of laser drilling process is used for drilling large holes either by rotating or moving the part. | |
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