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positive negative
avia.	正负
positive-negative
gen.	正-负
auto.	PN 结
el.	P 型-N 型
English thesaurus
positive-negative
el.	PN (结)

positive- negative: 90 phrases in 22 subjects

Air defense	1
Automobiles	2
Aviation	10
Chemistry	1
Computers	1
Earth sciences	1
Economy	1
Electronics	27
General	7
Geophysics	2
Ice hockey	1
Information technology	1
Logistics	1
Oil / petroleum	3
Pharmacology	1
Polygraphy	2
Securities	1
Space	4
Sports	1
Technology	16
Telecommunications	3
Textile industry	3