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| 内极式同步发电机; 旋转磁场式同步发电机 | |||
| 局部电场; 内电场 | |||
| 内场 | |||
| 内源场 | |||
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internal field : 13 phrases in 7 subjects |
| Air defense | 1 |
| Electric machinery | 2 |
| Electronics | 2 |
| Hydroelectric power stations | 1 |
| Semiconductors | 1 |
| Space | 2 |
| Technology | 4 |
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