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【单选题】
佛尔哈德法返滴定测I一时,指示剂必须在加入AgN03溶液后才能加入,这是因为( )。
A.
AgI对指示剂的吸附性强
B.
AgI对I-的吸附性强
C.
Fe3+能将I-氧化成I2
D.
终点提前出现
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