39 一般來說,乳齒(temporary teeth)最早發生牙齒萌出(eruption of teeth)的是下列何者?
(A) Lower central incisor
(B) Lower lateral incisor
(C) Upper central incisor
(D) Upper lateral incisor

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統計: A(4), B(0), C(3), D(0), E(0) #2418454