亚洲视频二区全集观看-黄片免费在线看一区二区-欧美一级爱a免费观看-黄片免费观看大全-美女国产黄色三级片在线播放-免费观看一级片网址-韩中一级黄色a免费-欧美日韩aaa一级-欧美特级A黄片中美A片

Engineering plastics are plastics that can be used as engineering materials and to replace metals. It requires excellent mechanical function, heat resistance and dimensional stability. The main ones are polyoxymethylene, polyamide, polycarbonate, ABS plastic and so on. For example, the mechanics and mechanical functions of ... Read More

In recent years, the influence of humidity on polymer materials has been paid special attention. One of its scenes is the influence of humidity factors on the reliability of equipment in the fields of microelectronics and microelectromechanics, such as causing materials to swell and deform, ... Read More