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   Althoughmanhasknownasbestos(石棉)formanyhundredsofyear...
問題詳情:   Althoughmanhasknownasbestos(石棉)formanyhundredsofyears,itwasnotuntil160yearsagothatitwasminedforthefirsttimeontheNorthAmericancontinent.H.W.Johns,ownerofaNewYorkCitySupplyShopforroofers...
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