50.圖中箭頭所指的牙髓內團塊物質為何?
(A)真牙髓石(true pulp stone)
(B)假牙髓石(false pulp stone)
(C)拉士克神經叢(plexus of Raschkow)
(D)牙骨質結石(cementicle)
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統計: A(503), B(979), C(26), D(64), E(0) #3135197
統計: A(503), B(979), C(26), D(64), E(0) #3135197