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| 球间隙; 球隙 | |||
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| 球间隙; 球隙 | |||
| 球状放电器 | |||
| 球状避雷器; 球隙避雷器 | |||
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sphere-gap : 7 phrases in 3 subjects |
| Electronics | 3 |
| Hydroelectric power stations | 2 |
| Technology | 2 |
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