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直流电 2、交流电 (alternating current,简称为ac) 交流电是指方向和大小都随时间做周期性变化的电压或电流。 交流电类型很多，其中最常见是的正弦交流电。 Book your stay in belfast, northern ireland at ac hotel belfast by marriott. Welcome to ac hotel seoul gangnam your premier seoul, gangnam hotel experience experience modern sophistication, european … A站 a站全称 “acfun弹幕视频网”，成立于2007年6月，取意于anime comic fun。 她是字母表的第一位，很巧的是，a站其实也是国内第一家弹幕视频网 … Enjoy city centre accommodation beside the cultural hubs of … 电流里ac代表交流电。 电流里dc代表直流电。 科学上把单位时间里通过导体任一横截面的电量叫做电流强度，简称电流。通常用字母 i表示，它的单位是安培（ …