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| Q. |
Which of the following are the functions of assist gases? |
| A. | removal of molten material |
| B. | shield the lenses |
| C. | better efficiency |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: assist are used to remove the molten material, it also shield the lenses from expelled material and they are also used for obtaining better process efficiencies. | |
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