MCQOPTIONS
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| 1. |
The temperature at which plastic layer formation takes place during carbonisation of coal varies from __________ °C. |
| A. | 100 to 150 |
| B. | 350 to 450 |
| C. | 550 to 650 |
| D. | 700 to 850 |
| Answer» C. 550 to 650 | |