作业前，熟悉电路的电压和频率。
Know the voltages and frequencies of circuits before any work is done.
通过操作冲击电压的生物放电试验，研究了带电作业中屏蔽服对人体的防护效果。
Through the breakdown tests of life-form under switching impulse voltage, the protective effect of conductive clothes is studied.
通过操作冲击电压的生物放电试验，研究了带电作业中屏蔽服对人体的防护效果。
Through the breakdown tests of life-form under switching impulse voltage, the protective effect of conductive clothes is studied.
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