検索：GB/T30923-2014 プラスチックポリプロピレン（PP）溶融噴射用専用材**規格
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題名の通り、中国石化燕山石化などの企業によって策定された、熔噴級PP医療用マスク専用材料の**規格を友人が見つけられるよう手助けします。
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