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circular; em forma de toro |
toroidal : 28 phrases in 9 subjects |
Antennas and waveguides | 1 |
Earth sciences | 4 |
Electronics | 9 |
Mechanic engineering | 4 |
Natural sciences | 3 |
Nuclear and fusion power | 4 |
Physical sciences | 1 |
Superconductivity | 1 |
Transport | 1 |