The study of dynamic model of dust particle movement in coal face;
为此，开展农业物料颗粒运动规律的系统理论的研究尤为重要。
The particle system movement rule has been stated clearly in the classical of force.
经典力学中有关质点系的运动定律已经表述得相当清楚。
The particle system movement rule has been stated clearly in the classical of force.
经典力学中有关质点系的运动定律已经表述得相当清楚。
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