Two kinds of soft particles gypsum and mica particles which take relatively major proportion in composition of dust often can be found in failure contact areas.
云母和石膏是两种在细尘粒中比例较大的软质颗粒物，出现在失效触点区域造成电接触故障。
The purpose of researches on urban dust is focused on the source of dust material, composition of dust, distribution, migration and evolution, pollution effects and prevention and cure.
研究城市灰尘的目的是研究其物质来源、物质成分、分布规律、迁移演化、污染效应、防治治理等。
It is hypothesized that the primordial cloud of dust and gas from which all the planets are thought to have condensed had a composition somewhat similar to that of Jupiter.
据推测，所有行星都是由尘埃和气体组成的原始云团凝聚而成，其组成与木星的组成有些相似。
应用推荐