1)balance retalionship of forces,力的平衡2)calculation of force,力的计算3)force distributions,力的传递4)Modes of" force,力的模式5)force distribution,力的分布6)force measurements,力的检测
用法和例句
The force distribution of a two-dimensional hexagonal packing granular system of rigid,frictionless,spherical grains is studied under a vertical downward point force on a single grain at the top layer.