阿摩線上測驗
13. In the following, which one is the most acidic compound? 
(A) 1
(B) 2
(C) 3
(D) 4
(E) 2 = 3
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統計： A(18), B(10), C(3), D(0), E(0) #941837
統計： A(18), B(10), C(3), D(0), E(0) #941837
