物理选择题由四个选择项组成 ,一般可用观察法、排除法、计算法、特殊值代入法等常规的方法解出来 ,但对于某些选择题 ,如计算法找答案 ,效率较低。要敢大胆想象 ,利用特殊的思维方法———极限法 ,可找出正确答案 ,且效率高 ,准确性大。题目一　把相同的两只蜡烛中的一只截短 The physical selection question consists of four choices. Generally, it can be solved by conventional methods such as observation method, exclusion method, calculation method, special value substitution method, etc. However, for some multiple choice questions, such as the calculation method, the answer is less effective. We must dare to imagine that we can use the special method of thinking—the limit method—to find out the correct answer, with high efficiency and accuracy. Topic 1 Truncate one of the same two candles