患者,女性,18岁,面部检查发现下颌后缩,覆盖10mm,覆耠2mm,上颌左侧第一前磨牙至右侧第一前磨牙与下颌左侧第一前磨牙至右侧第一前磨牙形成开颌,四颗第一磨牙轻度拥挤,FMA 42°,下颌角141.5°,下颌升支高度偏短,四颗第三磨牙牙胚存在。有吮指习惯。 在排齐整平阶段常配合使用
A. 小平面导板
B. 斜面导板
C. 双侧后颌垫矫治器
D. Ⅱ类牵引
E. 上下颌垂直颌间牵引
患者,女性,17岁,颏部外形发育不良,口唇闭合时口腔周围肌肉呈现紧张状态,面下1/3高度偏大,开颌5mm,覆盖8mm,磨牙呈现完全的Ⅱ类咬合关系,上下颌前牙拥挤明显,前牙开颌,左右上中切牙唇侧扭转,左右上侧切牙完全腭侧错位,左右上尖牙低位唇向错位,ANB 7°,四颗第三磨牙牙胚存在,位置正常。 此患者的诊断应为
A. 单纯的牙列重度拥挤
B. 安氏Ⅰ类错颌
C. 安氏Ⅲ类错颌
D. 安氏Ⅱ类1分类,前牙开颌
E. 单纯的前牙开颌
Directions: Scan the following passage and find the words which have roughly the same meanings as those given below. The number in the brackets after each word definition refers to the number of paragraph in which the target word is. Write the word you choose on the Answer Sheet.(1)About three hundred years ago, there were approximately half a billion people in the world. In the two centuries that followed the population doubled, and, by 1850, there were more than a billion people in the world. It took only 75 years for the figure to double once more, so that now the population figure stands at approximately six and one half billion. Each day the population of the world increases by about 150,000. (2) In former centuries the population grew slowly. Famines, wars, and epidemics, such as the plague and cholera, killed many people. Today, although the birth rate has not changed significantly, the death rate has been lowered considerably by various kinds of progress. (3) Thus, at the same time that the industrial revolution made it possible to produce goods more cheaply and more quickly in factories, and agricultural revolution also took place. Instead of leaving fields empty every third year, farmers began to plant clover or some other crops that would enrich the soil. Instead of using only animal fertilizer, farmers began to use chemical fertilizers to keep the soil rich. These methods have enabled French farmers, for example, to get five times as much wheat as was obtained from the same land two centuries ago. (4) At the same time, constant progress has been going on in industry. Fifty years ago it took a day to assemble the pieces of an automobile. Today one factory can produce one car in a minute. Today, too, it takes only one textile worker to supervise the production of as much cotton cloth as 4,000 workers could have produced in the eighteenth century. Modern industry needs large numbers of specialized workers. The less specialized workers are gradually being replaced by new machines. Large quantities of raw materials, sometimes brought from halfway around the world, are also needed. To work the machines, energy must be supplied from sources such as coal, waterpower, electricity and oil. And to build, maintain and improve modern factories, great financial resources are necessary. A factory is often the property of a society or a government, rather than the property of one person. to take place of (para. 4)