短語詞組短語particle settling aid 微粒助沉劑discrete particle settling 自由沉澱terminal velocity of particle settling 沉降末速settling particle 沉降粒子equal settling particle 等沉粒free settling particle 自由沉降顆粒equal jigging settling particle 等落粒free rotor gyroscope settling particle 自由沉降顆粒 返回 particle settling