八戒午夜理论影片A_色偷偷色噜噜狠狠网站蜜芽_国产手机在线亚洲视频播放_日韩一区无码_日本不卡在线观看播放_國產成人綜合歐美精品久久_午夜精品视品在线无码不卡_欧美乱妇高清无乱码大全_日韩一区二区国色天香_午夜a成v人电影

"The scientific name of nylon is polyamide, which is also a general term for thermoplastic resins. There are many kinds of nylon, with large production capacity and wide application. And its molecular structure is nylon fiber.

Nylon has good comprehensive properties, and its fiber strength is 1-2 times higher than that of cotton. It has the significant advantage of replacing steel, iron, copper and other metals with plastics in production and manufacturing, and is an important engineering plastic.