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【单选题】
实验室配制和保存FeSO 4 溶液时,应采取的措施是( ) 1 把蒸馏水煮沸,以赶走水中溶解的O 2 2 加入少量还原铁粉,并充分振荡 3 加入少量盐酸A.
①③
B.
①②
C.
②③
D.
③
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