The results show that themodified cen ments have much smaller article sizes and higher specific surface areas;
试验结果表明，改性处理使以上耐火水泥的颗粒尺寸大大降低，比表面积增加；
Their specific surface areas and apparent and skeletal densities were determined according to conventional methods.
按照通常方法，测定了它们的比表面积、堆积密度、骨架密度。
The experiment method of the measurement nanoparticles specific surface areas by the nitrogen adsorption method is investigated.
本文研究了用氮吸附法测定纳米粒子比表面积的实验方法。
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