与可摘局部义齿稳定无关的是
A．翘动
B．弹跳
C．摆动
D．旋转
E．移位
参考答案：B
解析：义齿的稳定是指义齿在行使功能时不翘动、不摆动、不旋转等。一个固位好的义齿，其稳定性也应很好。而固位好是指义齿在口腔内就位后，不因口腔生理运动的外力作用而向向或就位道相反方向脱位，即义齿发生移位。所以与稳定有关的因素应该是：翘动、摆动、旋转的移位。 义齿弹跳多见于卡环臂在导线上或基牙的非倒凹区，或卡环尖端搭在邻牙上成支点，义齿不能完全就位，所以与义齿的稳定无关，故选答案B。
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| From a plane you can see the fields, cities, mountains and rivers 1 _. If we go into space, we can see more and more of the earth. People and man-made satellites are sent out into space to look at the earth, the stars and other planets and 2 _more about the universe.On october 15th, 2003, China sent successfully its first spaceship with people into the space. After moving around the earth fourteen times, the spaceship with people 3 __safely. By now, the USA, Russia and China have sent spaceships with people out into the space. And men have ___4__the moon~ our satellite, smaller than the earth. Plants can't grow on it because there is no air _ 5__ water on it． The moon has not its own light. It _ 6 _ back the light of the sun. when the sun is shining on the side of the moon that faces us, it looks like a great ball. We _ 7 _ see the moon when the sun is shining on the side of the moon that faces away from us. The moon isn't as __ 8 _to us as it looks. It is three hundred and eighty thousand kilometers away from the earth. Of course, we can fly to the moon in the spaceship. A spaceship flies at eleven kilometers a second. So it only _ 9 __ more than three days to get there _ 10_ spaceship. | |||
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