counter tube: 400 phrase in 15 subjects |
Antennas and waveguides | 1 |
Biology | 2 |
Earth sciences | 16 |
Electronics | 19 |
General | 1 |
High energy physics | 15 |
Measuring instruments | 33 |
Mechanic engineering | 1 |
Medical appliances | 2 |
Mining | 1 |
Nuclear physics | 41 |
Physics | 4 |
Technology | 8 |
Vacuum tubes | 4 |
Радиоактивное излучение | 252 |