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继电控制
chem.	bang-bang control
继电〔起停〕控制
construct.	bang-bang control

继电 控制: 113 phrases in 18 subjects

Air defense	2
Automobiles	21
Aviation	10
Chemistry	1
Electronics	17
General	5
Geophysics	1
Hydroelectric power stations	2
Information technology	2
Metallurgy	3
Military	1
Nautical	1
Oil / petroleum	1
Power system protection	10
Project management	1
Shipbuilding	1
Space	6
Technology	28