48 在金合金嵌體邊緣進行研光(burnishing)時,最適當的研磨材料是:
(A)碳化矽磨錐(carborundum point, green stone)
(B)砂紙捲(sand paper point)
(C)氧化鋁磨錐(aluminum oxide point, white stone)
(D)鑽石銼(diamond dresser)
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統計: A(89), B(41), C(69), D(20), E(0) #892269
統計: A(89), B(41), C(69), D(20), E(0) #892269