1力的合成和分解实际上是等效代换合力与它的分力的作用效果应当是相同的.在实验中第一次用两个弹簧秤互成角度通过细绳套拉橡皮筋使橡皮筋系 Template




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tomski1力的合成和分解实际上是等效代换合力与它的分力的作用效果应当是相同的.在实验中第一次用两个弹簧秤互成角度通过细绳套拉橡皮筋使橡皮筋系 coloring