document.writeln('

                          普通美式胎

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 螺纹直通 BPC 4-03

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                    BPE   T型三通  1

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                            BPE   T型

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                 BPU直通 12

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                                   T

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             直通变径 BPG 12-10

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 直通变径 8-6

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螺纹直通   BPC  8-01

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                   铁接头

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');