A.10s B.30s C.60s D.2min E.5min
A.穿破牙齦時(shí) B.合面露出時(shí) C.對(duì)頜牙也已萌出時(shí) D.牙萌出后達(dá)到合平面是 E.無時(shí)間限制
A.恒牙和乳牙均好 B.恒牙優(yōu)于乳牙 C.乳牙優(yōu)于恒牙 D.前牙優(yōu)于后牙 E.后牙優(yōu)于前牙