氟化物防龋作用机制是()
A.降低釉质表层的溶解度
B.改变口腔生态环境,不利于细菌生长
C.抑制糖蛋白在釉质表面的黏附
D.促进釉质再矿化
E.以上均正确
参考答案:E
氟化物防龋作用机制是()
A.降低釉质表层的溶解度
B.改变口腔生态环境,不利于细菌生长
C.抑制糖蛋白在釉质表面的黏附
D.促进釉质再矿化
E.以上均正确
参考答案:E
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Look at that big table. There are some books on 1___________. The books are 2___________. Near the books, there is a new computer. It's Mary's 3___________. 4___________ works on 5___________ computer. On the wall, there is a big picture. It's very nice. The picture is from Mary's mother. 6___________ is an art teacher. She teaches 7___________ in our school. She draws wonderful pictures. 8___________ call her Mrs. Brown. Mary and 9___________ are in the same class. 10___________ are good friends.
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