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