Low-frequency high-voltage protection 低频高压试验 Low-frequency hellogh-voltage test 低频高压实验 high-frequency mid-voltage standard apparatus 高频中电压标准仪 ..
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... low-frequency generator 低频发电机 low-frequency high-voltage test 低频高压试验 low-frequency impedance corrector 低频阻抗校正器 ...
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甚低频高压试验 very-low-frequency high potential test
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