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Agriculture
The practice of cultivating soil, crops, and livestock and the preparation or marketing of those products.The practice of cultivating soil, crops, and livestock and the preparation or marketing of those products.
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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。 ...