energy level : 26 phrases in 13 subjects |
Antennas and waveguides | 4 |
Astronomy | 1 |
Economy | 1 |
Electronics | 5 |
Energy industry | 1 |
Environment | 2 |
Food service and catering | 1 |
Medical appliances | 2 |
Name of organization | 2 |
Physical sciences | 2 |
Taxes | 1 |
Transport | 1 |
United Nations | 3 |