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（8分）有些实验方案的原理中往往只列举出用到的离子方程式。在准备这样的实验时，需要选择完成这些离子反应的试剂。请选择能够按照以下离子方程式进行反应的物质，写出相应反应的化学方程式。 （1）CO +2H CO ↑+H O___________________________。 （2）H +OH H O____________________________________。 （3）Cu +2OH Cu(OH) ↓____________________________。 （4）Ba +SO BaSO ↓_____________________________。
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