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动量守恒是自然界普遍规律之一，其守恒定律及应用是教学的重点．加强学生对定律的理解掌握及灵活应用，可培养和提高学生的多项能力及良好的思维品质．
Momentum conservation is one of the common laws in nature. Its conservation law and application are the focuses of teaching. Strengthen students 'understanding and application of the law and cultivate and improve students' multiple abilities and good thinking quality.