electrical frequency center indicator 电动指示器

electrical frequency center interconnection 电的互相联接 ; 电的相互联系

electrical frequency center log 电测钻井记录曲线

electrical frequency center loss 电气损耗

electrical frequency center null 零位电压

electrical frequency center jack 电起重机

electrical frequency center mains 主电源

electrical frequency center organ 电风琴

electrical frequency center image 电荷图象