使用手臂周长测量方法时应当在专业指导下进行。
Professional help should be used for the arm circumference method.
该文论述了负载电流为非正弦波时功率因数测量的新方法。
This paper presents a new method for measuring the power factor in nonsinusoidal load current.
四线法是精确测量小电阻时最常用的一种方法。
The four wires method is in common use to accurately measure a little resistance.
四线法是精确测量小电阻时最常用的一种方法。
The four wires method is in common use to accurately measure a little resistance.
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