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| 钳形功率因数表 | |||
| 功率因数表 | |||
| 功率因数计 | |||
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| 功率因数计; 功率因数表 | |||
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| 功率因素指示表 | |||
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power factor meter : 6 phrases in 2 subjects |
| Metallurgy | 1 |
| Technology | 5 |
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