在“力的合成的平行四边形定则 实验中橡皮条的一端固定于p点.如图所示用ab两只弹簧测力计将橡皮条的另一端拉至o点分别记录两分力的大小和 Template




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tomski在“力的合成的平行四边形定则 实验中橡皮条的一端固定于p点.如图所示用ab两只弹簧测力计将橡皮条的另一端拉至o点分别记录两分力的大小和 coloring