64.附圖根尖X光片中,黑色箭頭所指之放射線透過性(radiolucent)影像為何種構造? 
(A)neurovascular canal
(B)extension of periapical lesion
(C)artifact of x-ray image
(D)fracture line of bone
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統計: A(658), B(7), C(90), D(8), E(0) #1742073
統計: A(658), B(7), C(90), D(8), E(0) #1742073