spannungsfrei: 15 phrases in 12 subjects |
Aviation | 1 |
Electrochemistry | 1 |
Electronics | 1 |
Hygiene | 1 |
Medical | 1 |
Natural resourses and wildlife conservation | 3 |
Quantum electronics | 1 |
Radio | 1 |
Shipbuilding | 1 |
Silicate industry | 2 |
Technology | 1 |
Water supply | 1 |