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The radiation effect of high density polyethylene films in the air was studied.
本文研究了空气中高密度聚乙烯薄膜的辐射效应。
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Jacket: Black low mid or high density polyethylene.
护套：黑色低密度或中密度或高密度聚乙烯。
youdao
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Jacket: Black low mid or high density polyethylene.
护套：黑色低密度或中密度或高密度聚乙烯。
youdao