Asked | Open questions | Answered Points Date Pair Term / Answer given Level Status Gloss 4 Jan 3 '02 eng>esl covalent uniones covalentes pro closed ok - Feb 28 '01 eng>deu HCFC CFC (Chlorfluorkohlenstoffen) und HCFC (Hydrochlorfluorkohlenstoffe) pro closed no Asked | Open questions | Answered