如何通过简单3步测试，判断电动工具电源正常么，我每次都这样做
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朋友发来3块电动工具电源，自己认为是损坏有故障的，殊不知电源并没有故障，日常使用中我们可以通过3个步骤检测，来判断电动电源是否故障，减少损失
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