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токи естественного происхождения | |||
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естественные земные токи | |||
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земной ток |
natural currents : 14 phrases in 10 subjects |
Antennas and waveguides | 1 |
Cement | 1 |
Electricity | 2 |
Electrochemistry | 1 |
Geology | 2 |
Geophysics | 1 |
Mass media | 1 |
Mining | 1 |
Programming | 1 |
Technology | 3 |