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insulation level
el.	绝缘电平
el.gen.	绝缘水平
nucl.pow.	绝缘强度
wind.	绝缘等级

insulation level: 22 phrases in 7 subjects

Electric machinery	3
Electricity	2
Electronics	9
Geophysics	2
Hydroelectric power stations	3
Oil / petroleum	1
Technology	2