class-B
| push-pull sound track
| class B | |
| radio | B-Betrieb |
| push-pull sound track | |
| tech. | Gegentakttonspur |
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| B-Betrieb einer Verstärkerstufe | |||
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class-B : 25 phrases in 10 subjects |
| Communications | 1 |
| Economics | 1 |
| Electronics | 4 |
| General | 1 |
| Materials science | 1 |
| Measuring instruments | 1 |
| Medical | 6 |
| Microsoft | 1 |
| Technology | 8 |
| Transport | 1 |