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问题 单项选择题 A1型题

全冠黏固后出现龈缘炎，其原因不可能是（）

A.轴壁突度不良

B.冠边缘过长

C.冠边缘不密合

D.龈沟内黏固剂残留

E.咬合早接触

答案

参考答案：E

解析：全冠黏固后出现龈缘炎，其可能的原因有：轴壁突度不良；冠边缘过长；龈沟内黏固剂残留；冠边缘不密合。

问答题

Directions:

The figure shows the percentage of employees in each occupation absent from work for at least one day in a reference week in 1999 due to injury or illness.

Write a report for a university lecture describing the information shown below.

You should write about 160—200 words neatly on ANSWER SHEET2.

Percentage of employees absent

(Figures in brackets equal number of employees couted)
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问答题 简答题

什么是共沉淀分离法？
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