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真空开关 zhēnkōng kāiguān
el. vacuum-operated switch
hydroel.st. vacuum switch
telecom. vacuum relay
真空〔电子〕开关
met. vacuum switch
真空控制开关
tech. vacuum switch
真空 开关
: 34 phrases in 5 subjects
Automobiles23
Aviation1
Electronics3
Metallurgy1
Technology6