问题
问答题 简答题
简述精密和超精密加工技术的发展。
答案
参考答案：
精密和超精密加工的发展分为两大方面：一是高密度高能量的粒子束加工的研究和开发；另一方面是以三维曲面加工为主的高性能的超精密机械加工技术以及作为配套的三维超精密检测技术和加工环境的控制技术。
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简述精密和超精密加工技术的发展。
参考答案：
精密和超精密加工的发展分为两大方面：一是高密度高能量的粒子束加工的研究和开发；另一方面是以三维曲面加工为主的高性能的超精密机械加工技术以及作为配套的三维超精密检测技术和加工环境的控制技术。
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| I was fifteen months old, a happy kid until the day I fell.It was a__1__fall.I landed on a glass rabbit which cut my eye badly enough to make it blind.Trying to save the eye, the doctors stitched (缝合) the eyeball together where it was__2__, leaving a big ugly scar (疤痕) in the middle of my eye.The attempt __3__, but my mother, in all of her wisdom  , found another doctor who knew that if the eye wereremoved__4__, my face would grow up badly distorted (扭曲), __5__my scarred, sightless, cloudy and gray  eye lived on with me.As I grew, this sightless eye in so many ways__6__me.I walked with my face looking at the__7__so that people would not see the__8__me.Yet my mother would say to me, at every turn, "Hold your head up high and__9__the world.If you hold your head up high, it will be OK, and people will see your__10__soul." She continued this__11__wheneve  r I wastrying to hide. Mama's words were of great help for me to face the world__12__.As a teenager, even though I tended to look down to hide my shame, I found that sometime when I held my head up high and let people know me, they__13__me.In high school, I was_  _14__both academically and socially.I was__15__elected class president.My mother's words helped me begin to realize that by letting people look at my face, I let them__16__the intelligence and beauty behind both eyes, even if they couldn't see it on the__17__. Now I'm a happy wife and great mother.The message "Hold your head up high" has been__18__ many times in my__19__home.Each of my children has felt__20__invitation, and the gift my mother gave me has lived on in another generation. | ||||
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