问题
单项选择题 A1型题
根部牙本质的形成取决于()
A.成釉器
B.牙 * *
C.牙囊
D.上皮根鞘
E.上皮隔
答案
参考答案:D
解析:
牙冠发育完成后,内釉和外釉上皮增生成上皮根鞘,上皮根鞘的内侧面包围着牙 * * 细胞,分化出成牙本质细胞,进而形成根部牙本质,故选D。
根部牙本质的形成取决于()
A.成釉器
B.牙 * *
C.牙囊
D.上皮根鞘
E.上皮隔
参考答案:D
解析:
牙冠发育完成后,内釉和外釉上皮增生成上皮根鞘,上皮根鞘的内侧面包围着牙 * * 细胞,分化出成牙本质细胞,进而形成根部牙本质,故选D。
根据短文内容,选择最佳答案。 Mike is 15 years old and Rose is 13 years old. One day they went to see the doctor. Because they had bad colds and coughed terribly. After checking, the doctor gave them two bottles of medicine to take. There are the words on the mark of the bottles:
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