A.C21H31COOH B.C31H41COOH C.C22H22COOH D.C22H43COOH
A.pH=2的稀硫酸 B.pH=2的甲酸溶液 C.0.010mol•L-1鹽酸 D.0.010mol•L-1的苯酚溶液
A.Cu(OH)2 B.Cu2(OH)2 C.Cu2(OH)2SO4 D.3Cu(OH)2•CuSO4