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光开关
gen. photorelay
space optical switch
telecom. light switch; optical switching
光开关
: 200 phrase in 16 subjects
Agriculture1
Architecture1
Automobiles37
Aviation2
Electricity2
Electronics64
Exhibitions1
General1
Geophysics3
Information technology7
Metallurgy1
Oil / petroleum1
Radio1
Space9
Technology58
Telecommunications11

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