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| Àà±ð×éºÏ | ËáÐÔÑõ»¯Îï | ¼îÐÔÑõ»¯Îï | Ëá | ¼î | ÑÎ |
| A | CO | CuO | H2SO4 | NH3¡¤H2O | Na2S |
| B | CO2 | Na2O | HCl | NaOH | NaCl |
| C | SO2 | Na2O2 | CH3COOH | KOH | CaF2 |
| D | NO2 | CaO | HNO3 | Cu(OH)2CO3 | CaCO3 |