MCQOPTIONS
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MCQOPTIONS
| 1. |
Which of the following is most commonly used as carburizing gas? |
| A. | CH<sub>4</sub> |
| B. | CO |
| C. | N<sub>2</sub> |
| D. | C<sub>2</sub>H<sub>2</sub> |
| Answer» B. CO | |