Yog tias koj muaj lus nug txog kev hais lus los yog kev koom tes, thov koj xa email rau peb ntawm fu.yangqing@dhchain.com @ mechanicalseal.com.cn los yog siv daim ntawv nug nram qab no. Peb tus neeg muag khoom muag yuav tiv tauj koj tsis pub dhau 24 teev. Ua tsaug rau koj kev txaus siab rau peb cov khoom.
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