A.乳牙釉質(zhì)有機(jī)質(zhì)的含量較低 B.乳牙釉質(zhì)的化學(xué)反應(yīng)性更活潑 C.乳牙釉質(zhì)的硬度更大 D.乳牙釉質(zhì)厚度更厚 E.乳牙釉質(zhì)的氣孔率和吸水率較小