磁性精美印刷角度尺白板
組合：磁性白板尺寸600×600mm
配件：彈簧稱500g 2支，彈簧1條
Used for experimentally verifying the laws of composition and resolution of forces utilizing vector diagrams of several concurrent forces.
The white board is 600× 660mm with printed protractor. Includes a spring and 2 spring scales.
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