Silicosis is a disabling respiratory disease caused by inhaling silica dust, which is used in the production of glass products, optical fibers, cement, and more.
矽肺病是一种因长期吸入二氧化硅粉尘而导致的呼吸系统衰竭的疾病，二氧化硅可用于生产玻璃制品，光纤，水泥等物品。
This paper investigates the design theories and methods ir applying the single and dual cement aplanats in the optical system used in surveying and metrology.
本文研究单不晕镜和双胶不晕镜用于测绘与计量光学系统的设计理论和方法。
J-646, a new optical photosensitive cement is characterized by good transmissivity, small shrinkage, moderate strength, good ageing resistance, less toxicity and low cost.
光敏胶具有透光率好，收缩率小，粘接强度适中，耐老化，毒性小和成本低廉等特点。
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