30 下列何種研磨劑 (abrasive) 對於牙科陶瓷 (dental porcelain) 之磨耗最為困難?
(A)鑽石粉 (diamond powder)
(B)碳化矽 (silicon carbide)
(C)柘榴石 (garnet)
(D)浮石 (pumice)
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統計: A(25), B(49), C(24), D(149), E(0) #2229324
統計: A(25), B(49), C(24), D(149), E(0) #2229324