53.主動萌牙(active eruption)主要原因為何?
(A)Contraction of periodontal ligament
(B)Recession of oral epithelial cells
(C)Splitting of enamel epithelial cells
(D)Recession of enamel epithelial cells
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統計: A(350), B(63), C(28), D(38), E(0) #1032708
統計: A(350), B(63), C(28), D(38), E(0) #1032708