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Consumer electronics
A broad field of electronics that are purchased for casual use or entertainment rather than for professional use; such as TVs, VCRS, DVD players,mp3 players, hi fi stereos, games consoles as well as Internet appliances.
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Consumer electronics > 
頻率
Agriculture; Animal feed
1.的每秒的交變電流週期數 （示例： 60 週期每秒或每秒 60 赫茲）。 2.操作發生的時間單位的次數。頻率是所有聲音的基礎。 A 泵或電機的基本頻率等於它的速度在每秒抽分庭的數量乘以革命。 ...
