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frequency meter |
测频仪: 85 phrases in 14 subjects |
Air defense | 4 |
Animal husbandry | 1 |
Aviation | 5 |
Earth sciences | 2 |
Electronics | 13 |
General | 6 |
Geophysics | 5 |
Latin | 1 |
Mechanics | 1 |
Metallurgy | 2 |
Oil / petroleum | 5 |
Space | 8 |
Steel production | 1 |
Technology | 31 |