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двуокись марганца stresses
chem.	battery manganese; black oxide of manganese; manganese binoxide; manganese bioxide; manganese dioxide; manganese oxide; manganese peroxide
el.	manganese black
el.chem.	manganese black (MnO2)
met.	manganese superoxide

двуокись марганца: 4 phrases in 3 subjects

Construction	1
Electrochemistry	2
Natural resourses and wildlife conservation	1