65.圖中箭頭所指之放射線透過性線條(radiolucent line)為下列何者在下顎上升枝的重疊影像?(A)鼻腔氣道(nasal airway)(B)鼻咽(nasopharynx)(C)口腔氣道(oral airway)(D)咽帆(velopharynx)