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极化继电器 jíhuà jìdiànqì
el. polarity-directional relay
hydroel.st. electro polarized relay
IT electropolarized relay; polarized relay
met. directional relay
PSP polarized elementary relay
tech. neutral relay
telecom. biased relay
极化继 电 器: 17 phrases in 6 subjects
Air defense1
Communications1
Electronics6
Hydroelectric power stations3
Power system protection2
Technology4