At present in the general of dc outside, according to the actual need to still can use cycle reversingcurrent and pulse current.
目前除采用一般的直流电外，根据实际的需要还可采用周期换向电流及脉冲电流。
2
It and reversingcurrent different is not to be, but with a anode intermittently stop, because the intermittent power supply current interrupted, cathode potential with time periodically change.
From here, it is possible to round-trip by reversing the transformation (looking in the class attribute for the specializing element name, and renaming the current element to match).