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Online services
Any business that provides its subscribers with a wide variety of data transmitted over telecommunications lines, an infrastructure in which they can communicate with one another as well as the means to connect with an almost unlimited number of third-party information providers.
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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。 ...
