用 EDTA 滴定金属 M, 若 M 分别与 A,B,C 三种络合剂发生副反应 , 此时计算 M 的公式是( )。
A.
α M =α M(A) +α M(B) +α M(C) -1
B.
α M =α M(A) +α M(B) +α M(C) -3
C.
α M =α M(A) +α M(B) +α M(C) -2
D.
α M =α M(A) +α M(B) +α M(C)
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