化学计算型选择题大多数可以通过直接法求解,但往往比较繁琐、费时,且容易出现计算错误。如果我们能有效地利用题中所给的信息,综合某些原理、规律等,则可以巧解某些计算型选择题。1.守恒法根据计算过程中某些量的守恒原则,从变化中找守恒量,可 Most of the chemical calculation multiple-choice questions can be solved by the direct method, but they are often cumbersome, time-consuming, and prone to calculation errors. If we can effectively use the information given in the questions and synthesize certain principles, laws, etc., we can solve some computational multiple-choice questions. 1. The conservation law finds conservation values ​​from changes based on the principle of conservation of certain quantities in the calculation process.