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hdpe双壁波纹管DN200
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hdpe双壁波纹管DN225
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hdpe双壁波纹管DN300
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hdpe双壁波纹管DN400
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hdpe双壁波纹管DN500
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hdpe双壁波纹管DN600
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hdpe双壁波纹管DN700
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hdpe双壁波纹管DN800
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联塑HDPE双壁波纹管-LS I
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