frequency withstand voltag
... strength of screw and nut for mounting 螺丝和螺母的机械强度试验 Test of power-frequency withstand voltag 工频耐压试验 Test of rated conditional short-circuit current of auxiliary contact 辅助触头的额定限制短路电流试验 ..
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frequency withstand voltag
频率耐压
以上为机器翻译结果，长、整句建议使用 人工翻译 。