27. 下列何者開口於後顱腔(posterior cranial cavity)?
(A)舌下神經管(hypoglossal canal)
(B)棘孔(foramen spinosum)
(C)視神經管(optic canal)
(D)篩孔(ethmoidal foramen)

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統計： A(5), B(1), C(0), D(0), E(0) #896863