MCQOPTIONS
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MCQOPTIONS
| 1. |
Which intermediate refrigerants were used for the first time in the cascade system? |
| A. | CO<sub>2</sub> and CO |
| B. | CO and SO<sub>2</sub> |
| C. | NH<sub>3</sub> and CO<sub>2</sub> |
| D. | CO<sub>2</sub> and SO<sub>2</sub> |
| Answer» E. | |