“验证力的平行四边形定则 的实验情况如图甲所示其中a为固定橡皮筋的图钉o为橡皮筋与细绳的结点ob和oc为细绳.图乙是在白纸上根据实验结果 Template




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tomski“验证力的平行四边形定则 的实验情况如图甲所示其中a为固定橡皮筋的图钉o为橡皮筋与细绳的结点ob和oc为细绳.图乙是在白纸上根据实验结果 coloring