<small id="jbojl"><code id="jbojl"></code></small>

<ruby id="jbojl"><i id="jbojl"></i></ruby>

    <optgroup id="jbojl"><li id="jbojl"></li></optgroup>
      <span id="jbojl"><output id="jbojl"><b id="jbojl"></b></output></span>
    1. <span id="jbojl"><output id="jbojl"></output></span>
      1. <optgroup id="jbojl"><li id="jbojl"></li></optgroup>
      2. > News information > News

        The production process of building gypsum

        From the natural dihydrate gypsum or chemical gypsum after a certain temperature heating calcination, the dehydration gypsum dehydration decomposition, to be semi-hydrated gypsum as the main component of the produc…

        2016-12-29

        View details

        COUNT:6?UP12NEXT?
        Online
        Phone number

        Scanning
        国产精品自在自线观看|人妻无码专区高清|国产会所在线播放|久久亚洲2019中文字幕