HAPPED
%2520Madal
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http://erialanekeemia.weebly.com/happed.html
TESTID JA VASTUSED ENESEKONTROLLIKS
Testid hapete kohta ja reaalajas kontroll
https://eis.ekk.edu.ee/eis/lahendamine/2443/edit
Hepete valemite ja nimetuste test ja reaalajas kontroll
https://eis.ekk.edu.ee/eis/lahendamine/2707/edit
http://keemiapohikoolile.weebly.com/happed.html
annaabi.ee 
