A new method for fabricating micro - optical elements with aspherical outlines is discussed.討論了一種制作非球面微光學(xué)元件的新方法.The natural properties and characteristics of shellac resin and its application in fabricating optical are d...
After comparison, prefabricated piles of reinforced concrete are chosen.通過分析比較，確定選用鋼筋混凝土預(yù)制樁。...high-quality, Scandinavian prefabricated wooden homes.斯堪的納維亞優(yōu)質(zhì)的預(yù)制木屋The little prefabricated hut was lifted away by a huge cra...