三力汇交原理 物体受三个共面非平行外力作用而平衡时,这三个力的作用线或反�延长线必交于一点. 例5 一根长2 M,重为g的不均匀直棒 Template




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tomski三力汇交原理 物体受三个共面非平行外力作用而平衡时,这三个力的作用线或反�延长线必交于一点. 例5 coloring