半反应式 CuS + H 2 O ® SO 4 2- + H + + Cu 2+ + e - 的半反应称为 ___ ,其中被氧化的元素是 ___。 ( )
A.
还原,铜
B.
还原,氢
C.
氧化,氢
D.
氧化,硫
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