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Building Materials - Section 7 :: Discussion
| 9. | During smelting process, the combination of fuel in the furnace | |
| A. | forms carbon dioxide | |
| B. | carbon dioxide with carbon forms carbon mono-oxide | |
| C. | carbon mono-oxide reacts with Fe2O3 to form iron and liberates CO2 | |
| D. | all the above. | |
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