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第十课：机械

科学

滑轮是一种周边有槽的轮子，能穿上绳子或链条，用来移动重物，使重物上升或下降。它是一种简单机械，能应用在人们生活中，帮助减轻人们的工作。

单元十、机械

科学

滑轮在生活中的应用及其重要性

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