力的測量 (虎克定律)
1.中型底座,60CM鐵棒固定夾1個
2.附45cm長刻度尺1支
3.帶勾砝碼20g×6個,拉力彈簧×1條
4.另可選購
10g 砝碼-----$40
50g 砝碼-----$70
100g砝碼-----$90
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