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| ¡¡¡¡ÎïÖÊ Ñ¡Ïî¡¡¡¡ | a | b | c | d |
| A | Al | Al(OH)3 | NaAlO2 | NaOH |
| B | CH3CH2OH | CH3CHO | CH3COOH | O2 |
| C | Na2CO3 | NaHCO3 | NaOH | CO2 |
| D | Cl2 | FeCl3 | FeCl2 | Fe |