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觀察齒輪與輪軸轉動功能。
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。
配件：彈簧秤500g 1支，帶鉤砝碼 3個。
Used to demonstrat the concepts of gear systems Includes a spring scale, 3 cords with metal rings and 3 hooked masses.
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