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【简答题】
二氧化锰是制造锌锰干电池的基本材料．工业上以软锰矿为原料，利用硫酸亚铁制备高纯二氧化锰的流程如下 某软锰矿的主要成分为MnO 2 ，还含Si(16.27%)、Fe(5.86%)、Al(3.42%)、Zn(2.68%)和Cu(0.86%) 等元素的化合物．部分阳离子以氢氧化物或硫化物的形式完全沉淀时溶液的pH见下表，回答下列问题 (1)硫酸亚铁在酸性条件下将MnO 2 还原为MnSO 4 ，酸浸时发生的主要反应的化学方程式为______________________________． (2)滤渣A的主要成分为________． (3)加入MnS的目的是除去________杂质． (4)碱性锌锰干电池中，MnO 2 参与的电极反应方程式为__________________________． (5)从废旧碱性锌锰干电池中可以回收利用的物质有________(写出两种)．
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举一反三
【简答题】A．He went to David Field's home. B．He went on a river trip. C．He spent the whole day shopping. D．He went to another dinner party.
【单选题】Out _____ , and away ______ .
A.
the men went ; was he
B.
went the men ; he was
C.
went ; he
D.
the man went ; he was
【单选题】Why was Bob not able to go to the dinnerparty?
A.
He went on a trip.
B.
He went out shopping and missed the phone.
C.
He went to visit Tom and his wife.
D.
Both A and b.
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