模板1:,metalsaregenerallydefinedasthoseelementswhosehydroxidesfrombases(suchassodiumorpotassium).thenonmetals’hydroxidesfromacids(suchassulphur).,,withmetallicproperties,posedoftwoormoreelements,,inthesense,,mercialpurposes,-,,,steelsforcastings,forgings,,manganesesteel,nickelsteel,,,brass,,,
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