dyr-5（r419b）
shandong dongyue chemical co., ltd.
domestic sales office：0533-8520226/ 8518777
e-mail：hgxiaoshoubu@dongyuechem.com
foreign sales office：0533-8510071
e-mail：esales@dongyuechem.com
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domestic sales office：0533-8520226/ 8518777
e-mail：hgxiaoshoubu@dongyuechem.com
foreign sales office：0533-8510071
e-mail：esales@dongyuechem.com
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