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| 真空介电常数电容率 | |||
| 真空介电常数 | |||
| 真空的介电常数 | |||
| 真空介电常数电容率 | |||
| 真空电容率 | |||
| permittivity of vacuum: 2 phrases in 1 subject |
| Telecommunications | 2 |
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