发布时间:2025-01-31 09:23:12
简单的说就是前者需要电源,后者无需电源。区别在于有源滤波器可以有增益,无源滤波器无增益是衰减的,作用是一样地。
美的5p一拖二中央空调 为什么外机那里细管热 粗管冷的结露了 室内制冷还行但感觉好像一般
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