GB/T 3
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GB/T 3 wird规定不大于DN5的可以镀锌交货，大于DN5的管子如果想用镀锌管，那怎么办呢？请高手指教，也可以，第一件事是找厂家因为有的厂家做不了太大口井的管管
GB/T 3 中规定也可以但第一件事是找厂家因为有的厂家做不了太大口井的管管
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