warning signals: 42 phrases in 23 subjects |
Apollo-Soyuz | 1 |
Armored vehicles | 3 |
Astronautics | 3 |
Automobiles | 4 |
Construction | 3 |
Electrical engineering | 1 |
Electronics | 1 |
General | 3 |
Geology | 1 |
Makarov | 1 |
Maritime law & Law of the Sea | 1 |
Military | 1 |
Missiles | 1 |
Nanotechnology | 1 |
Nautical | 3 |
Navigation | 1 |
Physics | 1 |
Rail transport | 1 |
Road works | 1 |
Technology | 5 |
Telecommunications | 2 |
Telephony | 1 |
Transport | 2 |