| Select | | View | Download | | 50.1 Basic understanding of the chemical industry | | |
| 50.2 The petrochemical industry | | |
| 50.3 Production of vitamin C | | |
| 50.1 Basic understanding of the chemical industry (bilingual version) | | |
| 50.2 The petrochemical industry (bilingual version) | | |
| 50.3 Production of vitamin C (bilingual version) | | |
| Importance of industrial processes (combined version) | | |
| Importance of industrial processes (bilingual, combined version) | | |