通过调节电阻为较高的值，因此能够保持在SCR从击发直到AC电压达到其峰值的正方向。
By adjusting the resistor to a higher value, it is possible to keep the SCR from firing until the ac voltage has reached its peak value in the positive direction.
可调节电压变压器，电压输出为220v、20v、24v、28v，攻牙时根据攻牙力度需要可选择不同电压。
Adjustable voltage transformers, voltage output is 220v, 20v, 24v, 28v, tapping tapping efforts need to choose the time according to different voltage.
可调节电压变压器，电压输出为220v、20v、24v、28v，攻牙时根据攻牙力度需要可选择不同电压。
Adjustable voltage transformers, voltage output is 220v, 20v, 24v, 28v, tapping tapping efforts need to choose the time according to different voltage.
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