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light relay | |||
photoelectric relay | |||
scanner | |||
photoelectrical relay | |||
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phototube relay; photoelectric relay |
光 电继电器 : 54 phrases in 12 subjects |
Automobiles | 5 |
Aviation | 2 |
Electric machinery | 1 |
Electronics | 3 |
General | 2 |
Geophysics | 1 |
Metallurgy | 4 |
Oil / petroleum | 3 |
Power system protection | 6 |
Rail transport | 1 |
Shipbuilding | 1 |
Technology | 25 |