问题
单项选择题 A1型题
关于牙髓－牙本质复合体，正确的叙述（）
A.牙髓与牙本质对外界刺激的反应完全是分离的
B.接近釉牙本质交界的外周牙本质，牙本质小管直径大，密度小
C.在接近牙髓端的内层牙本质，牙本质小管直径小，密度大
D.外层牙本质的通透性比内层高
E.从洞底到髓腔的牙本质越厚，牙髓所受的刺激越小
答案
参考答案：E
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关于牙髓－牙本质复合体，正确的叙述（）
A.牙髓与牙本质对外界刺激的反应完全是分离的
B.接近釉牙本质交界的外周牙本质，牙本质小管直径大，密度小
C.在接近牙髓端的内层牙本质，牙本质小管直径小，密度大
D.外层牙本质的通透性比内层高
E.从洞底到髓腔的牙本质越厚，牙髓所受的刺激越小
参考答案：E
comes to the elephant and begins to look at it slowly. The old man goes up to him and says in his ear, “ Don’t say anything about the elephant befor
e I sell it. Then I will give you twenty dollars.”“All right,” says the young man. After the old man sells the elephant, he gives the young man twenty dollars and says, “ Now, can you tell me how you found the elephant’s bad ears?”“ I didn’t find the bad ears,” says the young man. “ Then why are you looking at the elephant slowly?” asks the old man. The young man answers, “Because I have
never seen an elephant before, and I want to know what it looks like.”
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