Kreatív projektek

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a drawing of a machine with four gears attached to the front and back ends,
복합 도르래(compound pulley) | 과학문화포털 사이언스올
the diagram shows how to use an electric device for measuring water and air pressures
How to Fix Your Boat to the Ceiling
Duckworks - How to Fix Your Boat to the Ceiling
an image of some sort of structure with numbers and words on it that are labeled in yellow
Simple machines: Pulleys