脉 宽调制 : 100 phrase in 16 subjects |
Air defense | 8 |
Automobiles | 3 |
Aviation | 5 |
Earth sciences | 2 |
Ecology | 2 |
Electronics | 33 |
Geophysics | 7 |
Hydroelectric power stations | 1 |
Mathematics | 1 |
Multimedia | 1 |
Radio | 1 |
Refrigeration | 2 |
Space | 10 |
Technology | 19 |
Telecommunications | 1 |
Wind Energy | 4 |