日韩Av无码中文字幕,av人摸人人人澡人人超碰下载,我的公强要了我高潮,国产精品久久久久野外

　　Monocrystalline silicon is also called the number, it is a more lively and non-metallic elements, with basic complete lattice structure of crystals, crystal material is an important part of, has been in the forefront of new energy development. Monocrystalline silicon is a kind of good semi-conducting materials, mainly used in semiconductor and solar photovoltaic industry. Polysilicon, is one of the elemental silicon form. Molten in the coagulation of elemental silicon in extreme cold conditions, the silicon atoms arranged in diamond lattice form into many forms, such as the crystal nucleus into different grain size, crystal orientation is the grain size, crystallization into polycrystalline silicon. Polycrystalline silicon material is the production of monocrystalline silicon raw material directly, is the modern artificial intelligence, automatic control, information processing, the photoelectric conversion semiconductor devices such as electronic information base material. Known as the footstone of microelectronics.