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Prof.de chimie

Popescu Castanela

Colegiul Tehnic de Posta si Tc.

"Gh. Airinei"

Bucuresti

 

 
Text Box: Prof.de chimie Popescu Castanela Colegiul Tehnic de Posta si Tc. "Gh. Airinei" Bucuresti     Lectii de Chimie                                                                                                                                                                                                         

 
 

 

 

 

 

 

 

Petrolul si carbunii

Tabelul periodic