国产成人传媒电影免费看,日韩AV高清不卡在线,中文字幕第一页午夜在线观看,久久国产精品偷

"Nylon", also known as "Capron" and "Chinlon", its chemical name is polyamide fiber. Everyone is no stranger to nylon, because the nylon products can be found everywhere in daily life. However, few people know its history. Nylon is the first synthetic fiber developed in the world.