21. 照足部(foot)的plantodorsal (axial) projection 時,X射線中心(central ray)應對至:
(A) Sth metatarsal bone 的底部(base)
(B) 3rd metatarsal bone 的base
(C) 1st metatarsal bone in base
(D) 1st metatarsal bone 的頭部(head)
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統計: A(0), B(3), C(0), D(0), E(0) #3671101
統計: A(0), B(3), C(0), D(0), E(0) #3671101