A.神經(jīng)調(diào)節(jié)B.大腦脊髓調(diào)節(jié)C.適應(yīng)性調(diào)節(jié)D.體液調(diào)節(jié)
A.牙釉質(zhì)厚,牙本質(zhì)松脆B.牙釉質(zhì)厚,牙骨質(zhì)松脆C.牙釉質(zhì)薄,牙本質(zhì)松脆D.牙釉質(zhì)薄,牙骨質(zhì)松脆