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为什么说五金是门窗的心脏？门窗五金怎么选择
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五金配件是门窗的心脏，起到的作用非常重要！五金成本在一个门窗里成本也不会太小。好门窗五金造价占门窗总造价的15%-30%。所以五金对门窗也很重要！ 门窗五金件的好坏会影响使用寿命。…
