摆锤W装在一根杆上，在轴a周围垂直移动，它由螺旋弹簧f所悬挂。

W is attached to a bar, movable vertically around an axis a and suspended by the helical spring F.

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摆锤W装在一根杆上，在轴a周围垂直移动，它由螺旋弹簧f所悬挂。

W is attached to a bar, movable vertically around an axis a and suspended by the helical spring F.

youdao