54. 依據下圖所標示之牙齦纖維群(gingival fiber groups),則下列何者正確? 
(A)1是circular fibers
(B)2是transseptal fibers
(C)3是dentogingival fibers
(D)4是dentoperiosteal fibers
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統計: A(40), B(40), C(50), D(337), E(0) #1032709
統計: A(40), B(40), C(50), D(337), E(0) #1032709