化学：1、 A和B 不 一定完全发生反应 要考虑过量情况
2、Cu+2AgNO3=Cu(NO3)2+2Ag
2KNO3+MgCl2=Mg（NO3）2+2KCl 不会发生反应 复分解反应 要有水 气体 沉淀
CO2+H2O=H2CO3 化合价 没有改变 C 都是+4价
1, A mother camel was walking with her son through the
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