中间电位作业 midial potential working
中间零位继电器 center zero relay
中线与相线间电位梯度 center gradient
中间零位电流计 centre-point galvanometer
使端部的两个电极（11、12）的电位相等，并在中间电极 （13）与端部电极（11、12）之间施加电压。
Potentials of two electrodes (11, 12) at two ends are equaled and voltage is applied between the intermediate electrode (13) and the end electrodes (11, 12).
本实用新型涉及一种基于旋转电位器的中间按键架构。
The utility model relates to a middle keying structure based on a rotating potentiometer.
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