问题
单项选择题 共用题干题
患者女性，70岁，全牙列缺失，主诉原下颌义齿固位较差，要求重新修复，查见患者下颌牙槽嵴严重吸收，上颌牙槽嵴尚可，颌位关系正常
利用中性区排牙，主要是为了获取哪一种固位力（）
A.增加义齿的吸附力
B.增加义齿的黏着力
C.增加口内的大气压力
D.义齿内外唇颊舌肌的挟持力
E.增大咬合面积来获取固位力
答案
参考答案：D
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患者女性，70岁，全牙列缺失，主诉原下颌义齿固位较差，要求重新修复，查见患者下颌牙槽嵴严重吸收，上颌牙槽嵴尚可，颌位关系正常
利用中性区排牙，主要是为了获取哪一种固位力（）
A.增加义齿的吸附力
B.增加义齿的黏着力
C.增加口内的大气压力
D.义齿内外唇颊舌肌的挟持力
E.增大咬合面积来获取固位力
参考答案：D
| 阅读理解。 | |
| Forests are large pieces of land covered with big trees. They are found all over the world, especially in places where there is enough sunshine and much rainfall. 1______ To build a house, we need wood for doors and windows. Beautiful chairs and tables are also made of wood. Teak (柚木) wood is very useful for ship-building. It is used for all parts of a ship where wood and metal come in contact (接触), for it has a kind of oil to keep metal away from rust (铁锈). 2______ For this, teak wood is an important railway building material. Forests are no less important than useful. They are the home of wild animals. Without them, those animals would run among the places where we live and work. 3______ Forests are helpful to weather, too. When it is very hot, they can be a good place for people to stay away from the sun. In winter, they can keep us from the cold. Forests can also stop the land from being washed away by heavy rain for the trees hold the soil together. 4______
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| 5. What's the best title for the passage? | |
| A. Forests and Animals B. Forests are all Over the World C. Forests are Important D. We never Cut Down the Trees |