无套内射AV二区,在线极速中文字幕,免费国精产品一二二三,最近韩国日本免费观看百度

　　In the polymer hollow fiber membrane spinning process, the introduction of reinforced braided hose or fine silk, in order to improve the strength of hollow fiber ultrafiltration membrane, ultrafiltration membrane to prevent broken wires occur during use. Reinforced hollow fiber membrane can be higher than ordinary hollow fiber membrane strength more than 5 times. Greatly reducing the use of ultrafiltration membranes in wastewater treatment process, due to the aeration caused by broken wires.