Wool also has a high settleable solid content . 羊毛还含有沉淀性能极好的固体物质。
German standard methods for the examination of water, waste water and sludge; general measures of effects and substances group h, determination of the settleable matter by volume in water and waste water 德国检验水废水和污泥的标准方法.第9部分:效果和物