矫治大的邻牙间隙(black space)可以采用的方法是A.直接固定矫治器关闭间隙B.邻面去釉后关闭间隙C.调节相邻牙轴倾度D.正位器E.活动矫治器
矫治大的邻牙间隙(black space)可以采用的方法是
A.直接固定矫治器关闭间隙
B.邻面去釉后关闭间隙
C.调节相邻牙轴倾度
D.正位器
E.活动矫治器
B.邻面去釉后关闭间隙
C.调节相邻牙轴倾度
D.正位器
E.活动矫治器
参考解析
解析：
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共用题干Black HolesMost scientists agree that black holes exist but are nearly impossible to locate.A black hole in the universe is not a solid object,like a planet,but it is shaped like a sphere（球体）. Astronomers（天文学家）think that at the center of a black hole there is a single point in space with infinite（无限的）density（稠密）.This single point is called a singularity（奇点）. If the singularity theory is correct,it means that when a massive star collapses,all the material in it disappears into the singularity.The center of a black hole would not really be a hole at all,but an infinitely dense point.Anything that crosses the black hole is pulled in by its great gravity.Although black holes do exist,they are difficult to observe.These are the reasons.No light or anything else comes out of black holes.As a result,they are invisible to a telescope.In astronomical terms,black holes are truly tiny.For example,a black hole formed by the collapse of a giant star would have an event horizon（视界）only 18 miles across.The nearest black holes would be dozens of light years away from Earth.One light year is about 6 trillion（万亿）miles. Even the most powerlul telescopes could not pick out an object so small at such a great distance.In 1994 the Hubble Space Telescope provided evidence that black holes exist.There are still answers to be found,however,so black holes remain one of the mysteries of the universe.The nearest black holes are hundreds of light years away from us.A:Right B:Wrong C:Not mentioned
共用题干Black HolesMost scientists agree that black holes exist but are nearly impossible to locate.A black hole in the universe is not a solid object,like a planet,but it is shaped like a sphere（球体）. Astronomers（天文学家）think that at the center of a black hole there is a single point in space with infinite（无限的）density（稠密）.This single point is called a singularity（奇点）. If the singularity theory is correct,it means that when a massive star collapses,all the material in it disappears into the singularity.The center of a black hole would not really be a hole at all,but an infinitely dense point.Anything that crosses the black hole is pulled in by its great gravity.Although black holes do exist,they are difficult to observe.These are the reasons.No light or anything else comes out of black holes.As a result,they are invisible to a telescope.In astronomical terms,black holes are truly tiny.For example,a black hole formed by the collapse of a giant star would have an event horizon（视界）only 18 miles across.The nearest black holes would be dozens of light years away from Earth.One light year is about 6 trillion（万亿）miles. Even the most powerlul telescopes could not pick out an object so small at such a great distance.In 1994 the Hubble Space Telescope provided evidence that black holes exist.There are still answers to be found,however,so black holes remain one of the mysteries of the universe.The sun is the heaviest star in the universe.A:Right B:Wrong C:Not mentioned
共用题干Black HolesMost scientists agree that black holes exist but are nearly impossible to locate.A black hole in the universe is not a solid object,like a planet,but it is shaped like a sphere（球体）. Astronomers（天文学家）think that at the center of a black hole there is a single point in space with infinite（无限的）density（稠密）.This single point is called a singularity（奇点）. If the singularity theory is correct,it means that when a massive star collapses,all the material in it disappears into the singularity.The center of a black hole would not really be a hole at all,but an infinitely dense point.Anything that crosses the black hole is pulled in by its great gravity.Although black holes do exist,they are difficult to observe.These are the reasons.No light or anything else comes out of black holes.As a result,they are invisible to a telescope.In astronomical terms,black holes are truly tiny.For example,a black hole formed by the collapse of a giant star would have an event horizon（视界）only 18 miles across.The nearest black holes would be dozens of light years away from Earth.One light year is about 6 trillion（万亿）miles. Even the most powerlul telescopes could not pick out an object so small at such a great distance.In 1994 the Hubble Space Telescope provided evidence that black holes exist.There are still answers to be found,however,so black holes remain one of the mysteries of the universe.The Hubble Space Telescope helps scientists to understand the nature of the universe.A:Right B:Wrong C:Not mentioned
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以下描述错误的是A.修复前对错位牙使用牙少量移动的矫治技术，能改善修复的效果B.对残根缺损达龈下的患牙，可以考虑用矫治的方法将其牵出C.牙列缺损并且有上前牙间隙的病例，可先将间隙关闭后再修复D.对进行性牙周炎患者，可用矫治技术解决牙周病造成的牙齿移位E.正确使用牙少量移动的矫治技术可以获得良好的效果
牙签使用的正确方法及适应证不包括哪一项（）A、牙龈乳头退缩，用来清洁邻面B、牙周治疗后牙间隙增大，用来清洁邻面和根分叉区C、牙签以45°进入牙间隙，牙签尖端指向面D、可清除邻面菌斑和嵌塞的食物并磨光牙面E、可普遍用于去除食物嵌塞
单选题大的邻牙间隙（blackspace）可以通过以下哪种方法矫治（）A直接固定矫治器关闭间隙B邻面去釉后关闭间隙C调节相邻牙轴倾度D正位器E活动矫治器