亲应该指的就是复分解反应吧.
HCl + AgNO3 → AgCl↓ + HNO3
H2SO4 + BaCl2 → BaSO4↓ + 2HCl
Ba(NO3)2 + H2SO4 → BaSO4↓ + 2HNO3
2HCl + CaCO3 → CaCl2 + H2O + CO2↑
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