金属烤瓷冠的禁忌证 A．牙体缺损较大而无法做充填治疗 B．牙体

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问题单项选择题

金属烤瓷冠的禁忌证

A．牙体缺损较大而无法做充填治疗
B．牙体过小无法取得足够的固位形和抗力形
C．金属与烤瓷间有牢固结合
D．机械结合
E．瓷层局部过厚

答案

参考答案：B

补全对话，情景问答

为下列问句选答语。

( )1. Can I help you?

( )2. How much is it?

( )3. What colour is it?

( )4.Is it cheap?

( )5. How many books do you have?

A. It's ten yuan.

B. No, it's expensive.

C. Fifteen.

D. Yes.

E. It's yellow.

判断题

最高容许浓度，指在一个工作日内任何时间都不应超过的浓度。