Professional⦁Integrity⦁Quality
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PH-A-1008
1.用槓桿原理來探討平衡的實驗2.組合:長 135cm (兩端附螺絲可調平衡) 烤漆平衡桿、柱高 125cm3.附球形塑膠砝碼 6 個
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