患者女，26岁，
因外伤冠折，要求修复，查见残根，断面在牙槽嵴以上，已行根管治疗术，无松动，无叩痛，余留牙正常
若为患者设计桩核烤瓷冠修复，根面制备时下述哪一项不正确（）
A．根面制备成唇舌向的两个斜面
B．唇舌斜面相交线应该偏向根管口舌侧
C．当不可能制备出两个斜面时，可以制备成平面或者凹面
D．唇侧斜面可制备成凹斜面
E．通常应该在颈部做出肩台
参考答案：B
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| I didn't cry when I learned I was the parent of a mentally handicapped (弱智的) child. "Go ahead and cry,"the doctor __1__ kindly.But I couldn't cry then nor during the months that followed. We sent her to a kindergarten in our neighborhood at age seven.I worried that she was the "__2__" child among twenty fiveyearolds. __3__,positive things began to happen to Kristi in her school,and to her schoolmates,too.When talking big of their own accomplishments,Kristi's classmates always took __4__ to praise her as well," Kristi got all her spelling words right today."No one would say that her spelling list was easier than anyone else's. During Kristi's second year in school,she __5__ a very special challenge.The big public event of the term was a __6__ based on the final outcome of the year's music and physical education activities.Kristi was __7__ in both.My husband and I felt __8__ about the day as well. On the day of the program,Kristi __9__ to be sick.Desperately I wanted to keep her home.Why let Kristi fail in a gymnasium __10__ with parents,students and teachers?What a simple __11__!But I finally got her onto the school bus. Just as I had forced my daughter to go to school,now I forced myself to go,too.Then I knew Kristi's __12__.Her class was divided into relay teams.With her slow and clumsy reactions,she would surely __13__ her team. But as Kristi's turn to __14__ neared,a change took place in her team.The tallest boy in the line stepped __15__ Kristi and placed his hands on her waist.Two other boys stood a little ahead of her. The __16__ the player in front of Kristi stepped from the sack(bag),the two boys seized it and held it open while the tall boy __17__Kristi and dropped her neatly into the sack.A girl ahead took her hand and supported her until she gained her __18__.Then off Kristi hopped (跳跃),smiling and proud. At the cheers of the crowd,I slipped out to thank Heaven for the warm and considerate people making it possible for my __19__daughter to be like her fellow human beings.Then I finally __20__. | ||||
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