23.左下顎第一恆臼齒(molar)以Universal Numbering System標示法記錄,應為?
(A)
(B)
(C)#19
(D)36
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統計: A(12), B(5), C(290), D(24), E(0) #2237826
統計: A(12), B(5), C(290), D(24), E(0) #2237826