66.下圖根尖X光片中，黑色箭頭所指為何種構造？ 
(A)Anterior nasal spine
(B)Intermaxillary suture
(C)Anterior floor of the nasal aperture
(D)Incisive foramen

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統計： A(468), B(33), C(39), D(11), E(0) #1379399