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【单选题】
为消除反应产生的红色氧化铜沉淀对滴定的干扰,加入的试剂是 ( )A.
醋酸铅
B.
亚铁氰化钾
C.
NaOH
D.
铁氰化钾
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参考解析：
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皮皮学刷刷变学霸
举一反三
【单选题】What did the researchers do after they gave the fish shots ?
A.
They gave all the fish in the fish tank some painkilling shots
B.
They put painkilling medicine in the water of both sides of the fish tank.
C.
They put painkilling medicine in the water of the natural side of the fish tank.
D.
They put painkilling medicine in the water of the empty side of the fish tank.
【单选题】What did Tom and Judy do with the tickets?
A.
They went to see the play.
B.
They gave them away to a close friend.
C.
They threw them away
【简答题】火山灰水泥拌制的大体积混凝土的养护时间不得少于（）。
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