21.如圖所示,A 處為全口義齒後緣,B 處的珠狀緣飾(bead)與振動線(vibrating line)之間距離應為多少 mm?
(A)0.5
(B)1
(C)2
(D)3
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統計: A(71), B(123), C(482), D(12), E(0) #1625513
統計: A(71), B(123), C(482), D(12), E(0) #1625513