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| 自然电流; 地表自然电流 | |||
| 地表自然电流地电流 | |||
| 自然流; 自然电流; 中性线电流; 地电流; 大地电流 | |||
| natural current: 6 phrases in 4 subjects |
| Electronics | 1 |
| Engineering geology | 1 |
| Oil / petroleum | 1 |
| Technology | 3 |
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