久久人妻少妇出轨中文字幕,一本大道东京热无码AⅤ片,情人伊人久久综合亚洲,国产亚洲这里只有精品

Polycrystalline silicon, also called polysilicon, is a material consisting of small silicon crystals. It differs from single-crystal silicon, used for electronics and solar cells, and from amorphous silicon, used for thin film devices and solar cells.