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问题 单项选择题

上颌磨牙进行全冠修复时，为避免食物嵌塞应有哪种观念（）

A.静态

B.生物材料学

C.生物力学

D.动态

E.形态学

答案

参考答案：D

解析：患牙原有水平性、垂直性食物嵌塞者，在全冠的外形设计上应考虑到食物流向的控制。

句型转换

按要求对下列句子进行句型转换。

1. This is my sister. (变为复数句)

                                                                                                                           

2. He is twelve years old. (对划线部分提问)

                                                                                                                           

3. Danny can fly a kite. (改为一般疑问句)

                                                                                                                            

4. I have two chairs. (改为否定句)

                                                                                                                            

5. Li Ming and Jenny want to go shopping today. (对划线部分提问)

                                                                                                                            

6. It's 6:40 now. (对划线部分提问) 

                                                                                                                            

7. The book is under the desk. (对划线部分提问)

                                                                                                                            

8. May I take your picture? (作否定回答) 

                                                                                                                            

9. Walk quickly，please. (改为否定句)  

                                                                                                                             

10. Are you hungry? (作肯定回答)

                                                                                                                              
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单项选择题

为防止电压互感器高压侧击穿进入低压侧，损坏仪表，危及人身安全，应将二次侧（）

A、接地

B、屏蔽

C、设围栏

D、加防护罩
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