21.當我們在修整全口義齒之磨光面(polished surface)的前牙牙齦蠟型時,蠟刀與水平面的夾角為:
(A)20°
(B)30°
(C)45°
(D)60°
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統計: A(46), B(121), C(540), D(147), E(0) #1845351
統計: A(46), B(121), C(540), D(147), E(0) #1845351