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phase-under-voltage
| relay
| phase-under-voltage | |
| gen. | 低相电压的 |
| relay | |
| el.mach. | 电气继电器; 继电器 |
| forestr. | 分程传递 |
| hydroel.st. | 继电器 |
| interntl.trade. | 转送; 补充; 接替 |
| met. | 替续器; 中继站 |
| |||
| 低相电压的 | |||
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phase-under-voltage relay : 4 phrases in 2 subjects |
| Air defense | 1 |
| Technology | 3 |
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