12.如下圖所示,下顎左側第三大臼齒依Pell and Gregory classification方法分類,下列何者正確?

(A)class A
(B)class 2
(C)class B
(D)class 3
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統計: A(57), B(241), C(790), D(104), E(0) #2181706
統計: A(57), B(241), C(790), D(104), E(0) #2181706