Editorial Note: This article is written with editorial review and topic relevance in mind.
基本概念： 交流电（ac） 是方向周期性变化的电流，比如家庭插座供电； 直流电（dc） 是方向固定的电流，比.
Twenty years ago today—the DC snipers were caught. Can’t believe it’s
Where Are The Dc Snipers Now Deadliest Duo Aka Beltway Youtube
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