梦梦电影免费高清在线观看-精产国产伦理一二三区-四虎成人网-国产精品手机在线-亚洲高清不卡-国产福利久久-囯产精品一品二区三区-国产一二区在线观看-国产乱码精品一区二三赶尸艳谈-亚洲 小说 欧美 激情 另类-91免费精品-久久久久久久亚洲精品-中文字幕+乱码+中文字幕明步-欧美少妇18p-久草新

"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.