[题目]有一只蓄电池,已无法辨认正、负极,请你用学过的知识,想办法正确地判断出它的正负极。(所用器材不限,要求画出示意简图并写出判断简法)。[解答](具体方法见下表) [Subject] There is a battery, and it is impossible to identify the positive and negative electrodes. Please use the knowledge you learned and think of ways to correctly determine its positive and negative polarity. (There is no limitation on the equipment used. It is required to draw a schematic diagram and write a simple method of judgment.) [Answer] (see the table below for the specific method)