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A | CuO | HCl | Ca£¨OH£©2 | CO2 | Mg |
B | Cu | O2 | C | CO2 | H2O |
C | Ï¡ÑÎËá | CaCO3 | CaO | H2O | P2O5 |
D | P | O2 | Fe | AgNO3 | CuCl2 |
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A. A B. B C. C D. D