42 下列那一構造之牙本質小管 (dentinal tubule) 是封閉的?
(A)死道 (dead tracts)
(B)繼生牙本質 (secondary dentin)
(C)透明牙本質 (transparent dentin)
(D)球狀牙本質 (globular dentin)
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統計: A(142), B(3), C(105), D(9), E(0) #2237159
統計: A(142), B(3), C(105), D(9), E(0) #2237159