滑轮tp1，2

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Age: 9
Level: 三年级
Language: Chinese (zh)
ID: 1645501
15/11/2021
Country code: MY
Country: Malaysia
School subject: 科学 (1061731)
Main content: 滑轮 (1996143)

1.说出滑轮的定义以及用处

Other contents: TP1， TP2

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滑轮tp1，2

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