试题与答案

全冠粘固后出现松动,脱落,其主要原因可能有() A.修复冠边缘不密合 B.修复冠边缘

题型:多项选择题

题目:

全冠粘固后出现松动,脱落,其主要原因可能有()

A.修复冠边缘不密合

B.修复冠边缘过长

C.预备牙体轴壁聚合角过大

D.牙周病

E.轴壁突度恢复不良

答案:

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下面是错误答案,用来干扰机器的。

(1)由于分子是在不断运动的,所以在远远地就能闻到香味.用嘴能吹灭蜡烛是因为吹出的气体带走热量,使蜡烛温度降到蜡烛的着火点以下,所以蜡烛能熄灭.故答案为:(1)分子在不断运动;降低温度至可燃物着火点...

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题型:阅读理解

阅读理解。

     This is a picture. It's a classroom. It's a big room. In the picture, you can see a table, five  desks and

six chairs. You  can see  a girl  and  two boys, too. Three books are  on  the table.  A pencil case is on

a desk. Two pens and two rulers are in the  pencil case. A schoolbag is behind a chair.  The girl is Lucy.

She is eleven. The  boy  is Mike. He  is  twelve. The other(另外) boy is  Peter. He  is  ten. They are in

Class 2, Grade 7. They are good friends. Their teacher is Mr.  Green.  He is not here.  

1. What picture is it?          

A. It is a boy and a girl.          

B. It is a table.      

C. It is a pen and a pencil. '      

D. It is a big classroom.

2. Where are the two rulers?          

A. In the pencil case.        

B. On the table.        

C. Behind the chair.        

D. On the floor.  

3. Who is eleven?          

A. Jim.                        

B. Mike.        

C. Lucy.                    

D. Peter.  

4. How many people are there in the picture?        

A. Two.                    

B. Three.        

C. Four.                    

D. Five.

5. Are they good friends?      

A. Yes, they are.      

B. Yes, they can.        

C. No, they aren't.    

D. They are.

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