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【单选题】
相同质量的 Fe3+（相对原子质量 55.85）和 Cd2+（相对原子质量 112.4），各用显色剂在相同体积的溶液中显色，用吸光光度法测定，前者用 2 cm 吸收池，后者用 1 cm 吸收池，测得的吸光度相同，则两有色络合物的摩尔吸收系数A.
Cd2+ 约为 Fe3+ 的 4 倍
B.
基本相同
C.
Fe3+ 约为 Cd2+ 的 2 倍
D.
Cd2+ 约为 Fe3+ 的 2 倍
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A.
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B.
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C.
borrow from classmates.
D.
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