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| Q. |
Which gas jet assisted process is suitable for most of the metals? |
| A. | oxygen gas |
| B. | nitrogen gas |
| C. | helium gas |
| D. | all of the mentioned |
| Answer» A. oxygen gas | |
| Explanation: oxygen-jet assistance is used for most metals, as the gas liberates additional energy by the exothermal chemical reactions. | |
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