vertical total | electron content
| electron content abbr. | |
| avia. | 电子含量; 电子浓度 |
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| VT | |||
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vertical total : 8 phrases in 6 subjects |
| Aviation | 1 |
| Drilling | 1 |
| Geophysics | 1 |
| Oil / petroleum | 2 |
| Surveying | 1 |
| Technology | 2 |