阿摩線上測驗
31. Which of the following is the softest base?
(A)H2O
(B)NH3
(C) PH3
(D)PF3
(E)too little information to tell
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統計： A(0), B(0), C(0), D(1), E(0) #3222639
統計： A(0), B(0), C(0), D(1), E(0) #3222639
