3. 下列酸性物質何者可使酸性過錳酸鉀溶液褪色?
(A)H2SO4
(B)HClO4
(C)H3PO4
(D)H2C2O4

答案:登入後查看
統計: A(7), B(6), C(20), D(96), E(0) #722972