Professional⦁Integrity⦁Quality
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PH-A-1021
1.觀察齒輪轉動功能的關係2.說明:將大、小齒輪及輪軸 橫掛支架上，輪軸上細線可掛重物實驗3.配件:彈簧秤500g 1支，帶鉤砝碼3個
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