短語詞組短語mean volume particle diameter 平均容積直逕arithmetic mean particle diameter 平均粒逕;算術平均粒逕harmonic mean particle diameter 調和平均粒逕logarithmic mean particle diameter 對數平均粒逕geometric mean particle diameter 幾何平均粒逕triaxial mean particle diameter 三軸平均粒逕mean molar quantity particle diameter 平均粒子直逕 返回 mean particle diameter