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下列方程式合理的是( )
C a ( O H ) 2 + N a 2 C O 3 = C a C O 3 ↓ + 2 N a O H
4 F e + 3 O 2 = 点燃 2 F e 2 O 3
K 2 S O 4 + C u C l 2 = C u S O 4 + 2 K C l
C u + F e C l 2 = F e + C u C l 2
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