MCQOPTIONS
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MCQOPTIONS
| 1. |
In a CO2 laser, a mixture of _____ is circulated through the gas tube. |
| A. | CO<sub>2</sub>, N<sub>2</sub> and He |
| B. | CO<sub>2</sub>, N<sub>2</sub> and Ar |
| C. | CO<sub>2</sub>, H<sub>2</sub> and N<sub>2</sub> |
| D. | CO<sub>2</sub>, I<sub>2</sub> and O<sub>2</sub> |
| Answer» B. CO<sub>2</sub>, N<sub>2</sub> and Ar | |