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鋁合金輕型對(duì)開(kāi)多葉調(diào)節(jié)閥，帶調(diào)節(jié)手柄。適用各種矩形、方形風(fēng)口的后面，達(dá)到調(diào)
節(jié)氣流大小的目的
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