document.writeln('

             内螺纹直通 BPCF 10-04

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              T正型三通  BPB6-02

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                   L型二通 BPL 8-02

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                                  三

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                            Y型三通 

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           Y型变径  BPN10-8

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            T侧三通 BPD 10-02

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Y型三通 BPX  6-03

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                           通用型PU气

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');