滑轮和齿轮

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Edad: 10
Level: 3
Idioma: Chinese (zh)
ID: 1633855
12/11/2021
Country code: MY
Country: Malaysia
Asignatura: 科学 (1061731)
Tema principal: 滑轮和齿轮的用处 (1615735)
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滑轮和齿轮

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