时间的平均值和瞬间值是什么意思?RT
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![时间的平均值和瞬间值是什么意思?RT](/uploads/image/z/10482370-34-0.jpg?t=%E6%97%B6%E9%97%B4%E7%9A%84%E5%B9%B3%E5%9D%87%E5%80%BC%E5%92%8C%E7%9E%AC%E9%97%B4%E5%80%BC%E6%98%AF%E4%BB%80%E4%B9%88%E6%84%8F%E6%80%9D%3FRT)
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