21.牙科植體離下齒槽神經(inferior alveolar nerve)至少要多少距離?
(A)0.3 mm
(B)1 mm
(C)2 mm
(D)4 mm
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統計: A(1), B(28), C(800), D(73), E(0) #2742221
統計: A(1), B(28), C(800), D(73), E(0) #2742221