• 1. perfect elastic collision: 完全弹性碰撞 | 弹性碰撞
• 2. non-perfect elastic collision: 非完全弹性碰撞
• 3. non perfect elastic collision: 非完全弹性碰撞

• 1.A measurement method of impact energy is proposed for the situations of perfect elastic collision and completely inelastic collision.
  提出完全弹性碰撞和完全非弹性碰撞情况下冲击能测量原理。
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