A.進(jìn)食燙面 B.機(jī)械摩擦 C.正畸鋼絲 D.咀嚼口香糖 E.尖銳牙尖刺激
A.多聚甲醛失活劑 B.金屬砷失活劑 C.亞砷酸失活劑 D.A或B E.A、B、C都可
A.上頜牙萌出順序1-2-3-4-5-6-7 B.上頜牙萌出順序1-2-4-5-3-6-7 C.上頜牙萌出順序6-1-2-4-5-3-7 D.下頜牙萌出順序6-1-2-3-4-5-7 E.下頜牙萌出順序6-1-2-4-5-3-7