有些计算型选择题,若用常规方法求解需要比较复杂的计算才能得出正确结论,但如果依据其化学背景从有关概念、原理入手,充分利用边界条件或选项特点通过估计、推理、排除、近似处理便可迅速准确得出结论, Some computational multiple-choice questions require more complicated calculations to obtain correct conclusions if they are solved by conventional methods. However, if they start from relevant concepts and principles according to their chemical backgrounds, they can make full use of boundary conditions or optional features through estimation, reasoning, exclusion, and approximation. Treatment can quickly and accurately draw conclusions.