true relative density meaning in English

真相对密度

Determination of true relative density of coal
煤的真相对密度测定方法
Coke - determination of true relative density
焦炭真相对密度测定方法
Coke - determination of true relative density , apparent relative density and porosity
焦炭.相对真密度相对表观密度和孔隙度测定
High - speed determination of true relative density , apparentrelative density and porosity of coke for export
出口焦炭真相对密度假相对密度和气孔率的快速测定法