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src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader030vdocumentspubreader030viewer20220404225e1034939d8a487f006ccc6ahtml5thumbnails8jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=9Page 9button div class=ts-imagea href=https:reader030vdocumentspubreader030viewer20220404225e1034939d8a487f006ccc6ahtml5page9jpg target=_blank img data-url=o-5-yitau-bo-quan-trong-10-tinh-co-nut-kfn-ho-c-nhn-theo-chun-tcvii-1694a75htmlpage=9 data-page=9 class=ts-thumb lazyload alt=Page 9: vanbanphapluatco filephong O 5 Yitau búo quan trong 10 tinh co nut kfn ho ïc nhán theo chuàn TCVII 1694—75 Inh Luong crom oxit tac: Oxy h6a crom 110 trong b6t mau tht:mb loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader030vdocumentspubreader030viewer20220404225e1034939d8a487f006ccc6ahtml5thumbnails9jpg 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