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  1. ????ĥ???????ɰ???ܵ?????ĥ?𽺽?ͷ????ĥ

    ????ĥ???????ɰ???ܵ?????ĥ ?𽺽?ͷ ????ĥ Wear-resistant rubber joint in mortar pipeline is more wear-resistant??

  2. ????ĥ????????ĥ?𽺽?ͷ????????ĥװ?á?

    ?Ϻ??????????????????޹?˾?ٷ???վΪ?????ܣ?????ĥ????????ĥ?𽺽?ͷ??????ĥװ????Ϣ??????????Ϊ?ڶ?? ???????ɰ???

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