ماشین های خیلی ساده: اهرم ها | فیزتک
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6 سال پیش
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Levers are a simple machine
Levers are a simple machine that help us make work easier. But how do they work and how can you make one to help you? Check out this episode with Squeaks and Jessi to learn all about levers!
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6 سال پیش
در تاریخ 1397/11/28 منتشر شده
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