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某些问题中的物理过程是渐变的.这一般要用积分求解,当还没有掌握积分时,可用“近似”思想,以“不变”代替“变”,可解决问题,请看:
The physical process in some problems is gradual. This is usually solved with integrals. When you have not yet mastered the integrals, you can use the “approximate” idea and replace “change” with “invariant” to solve the problem. See: