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Building Materials - Section 1 :: Discussion
| 48. | Pick up the correct statement from the following: | |
| A. | In basic Bessemer process, the steel heats the converter | |
| B. | In open-hearth process, the furnace heats the steel | |
| C. | In Siemens process, the impurities of pig iron are oxidised by the oxygen of the ore | |
| D. | all the above. | |
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