44. 下圖顯示在技工室製作金屬支架過程中,在支柱牙放置鑄造環周牙鉤(circumferential clasp)之部位需作適當的堵凹(blockout)或緩壓(relief),此處之堵凹屬於下列那一類? 
(A)成型式堵凹(shaped blockout)
(B)平行式堵凹(parallel blockout)
(C)緩壓(relief)
(D)任意式堵凹(arbitrary blockout)

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統計: A(317), B(299), C(2), D(18), E(0) #1153160

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