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1. C) Basic refractory bricks
2. A) √(ΣD² + ΣL²)
3. C) Azimuth
4. D) Zeolite process
5. C) Not reliable
6. C) Parallel line method
7. A) Straight line
8. C) Behind V.P., Below H.P.
9. D) Kankar
10. A) Al2O3
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