题目内容

21.牙周膜内各种新生细胞主要于

A. 成纤维细胞
B. 成牙骨质细胞
C. 成骨细胞
D. 破骨细胞
E. 未分化间充质细胞

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25.牙周膜的正常厚度为

A. 0.1mm
B. 0.15～0.38mm
C. 0.4mm
D. 3～4mm
E. 1～2mm

26.穿通纤维是

A. 牙髓中的纤维伸入牙本质中的部分
B. 牙周膜的胶原纤维埋入牙骨质的部分
C. 牙周膜的胶原纤维埋入釉质中的部分
D. 周膜的胶原纤维埋入牙槽骨的部分
E. 埋在牙骨质和牙槽骨中的胶原纤维

30.牙周膜中不含

A. 成纤维细胞
B. 牙骨质细胞
C. 上皮剩余
D. 破骨细胞
E. 成骨细胞

We cannot travel every path. Success must be won along one line. We must make our business the one life purpose to which every other must be ___. I hate a thing done by halves. If it be right, do it boldly. If it be wrong, leave it undone. The men of history were not perpetually looking into the mirror to make sure of their own size. _ in their work they did it.