超碰蜜桃|www.国产在线|北野未奈在线播放8mav|日b大片,日本aⅴ视频,99精品久久久久久久免费看蜜月,黄色专区

　　The material QML45Mn2 of Xingtai Iron and Steel Corp.,Ltd mainly used to produce the rivets for train. For this steel ,it has stable composition, low content of residual elements and strict size control. A terminal customers used the product for a long time, very few quality question, and has switched all procurement of raw materials to our products.