Steel is produced by adding ..... 1 ..... into molten iron so that ..... 2 ..... is removed from the iron. Stainless steel is ..... 3 ..... resistant to corrosion than mild steel. Which words fit gaps 1, 2 and 3?
- A1 basic oxides; 2 acidic impurities; 3 less
- B1 basic oxides; 2 carbon; 3 more
- C1 oxygen; 2 acidic impurities; 3 less
- D1 oxygen; 2 carbon; 3 more