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polarity reversal
accum. 反极
el. 极性反转［变化］
el.mach. 极性变换
oil 极性倒转; 极性反向
tech. 极性颠倒; 磁极倒转反转; 磁极倒转反向
polarity reversal: 13 phrases in 5 subjects
Electric machinery1
Information technology2
Oil / petroleum5
Space1
Technology4

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