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Ñ¡Ïî | A | B | C | D | |
Îï ÖÊ | ¼× | Ca(OH)2 | CO2 | H2 | Mg |
ÒÒ | Na2CO3 | NaOH | O2 | HCl | |
±û | H2SO4 | CaCl2 | CuO | CuSO4 | |
¶¡ | BaCl2 | K2CO3 | HCl | NaOH |
A. A B. B C. C D. D