A.1%~3% B.4%~6% C.7%~9% D.10% E.15%
A.鐘狀期 B.頸環(huán)形成后 C.上皮根鞘形成前 D.釉質(zhì)完全形成之后 E.牙本質(zhì)形成之前
A.漿液細(xì)胞 B.黏液細(xì)胞 C.閏管細(xì)胞 D.肌上皮細(xì)胞 E.儲(chǔ)備細(xì)胞