发信号 : 308 phrases in 25 subjects |
Astronautics | 2 |
Automobiles | 1 |
Aviation | 6 |
Biology | 2 |
Electric machinery | 1 |
Electrical engineering | 1 |
Electricity | 1 |
Electronics | 20 |
Energy industry | 1 |
General | 83 |
Household appliances | 1 |
Information technology | 2 |
International Monetary Fund | 2 |
Mathematics | 2 |
Metrology | 1 |
Military | 17 |
Missiles | 2 |
Nautical | 6 |
Oil and gas | 1 |
Oil processing plants | 5 |
Photography | 1 |
Radio | 8 |
Rail transport | 4 |
Technology | 137 |
Telecommunications | 1 |