1 在做验证力的平行四边形定则的实验时先用两个弹簧秤拉橡皮条再用一个弹簧秤拉橡皮条两次必须使橡皮条的终点达到同一位置这样做是为了 Template




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tomski1 在做验证力的平行四边形定则的实验时先用两个弹簧秤拉橡皮条再用一个弹簧秤拉橡皮条两次必须使橡皮条的终点达到同一位置这样做是为了 coloring