Methods: The freely falling object was used to simulate the animal models of closed cerebral trauma.
方法：采用自由落体法制备闭合性脑外伤小鼠模型；
The experimental apparatus for measuring the acceleration of the freely falling bar object is improved in this thesis.
改进了条形物体自由下落测量重力加速度的实验装置。
The experimental apparatus for measuring the acceleration of the freely falling bar object is improved in this thesis.
改进了条形物体自由下落测量重力加速度的实验装置。
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