2.下列專有名詞的解釋,何者正確?
(A)attrition: pathological wearing away of tooth structure secondary to a chemical agent. (B)abrasion: loss of tooth structure caused by a non-bacterial chemical process. (C)demastication: tooth wear accelerated by chewing an abrasive substance between opposing teeth. (D)perimolysis: loss of tooth structure caused by a mechanical process.