验证“力的平行四边形定则 实验如图所示a为固定橡皮筋的图钉o为橡皮筋与细绳的结点oboc为细绳图乙是在白纸上根据实验结果画出的图.图 Template




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tomski验证“力的平行四边形定则 实验如图所示a为固定橡皮筋的图钉o为橡皮筋与细绳的结点oboc为细绳图乙是在白纸上根据实验结果画出的图.图 coloring