单选题
1分
The power factor is a measure of the phase difference between voltage and current and is expressed a...
The power factor is a measure of the phase difference between voltage and current and is expressed as the ____of the phase angle
参考答案: C
参考解析: 功率因数是对电压与电流间的相位差的衡量,以相位角的余弦来表示。