cu zn cr alloy cuzncr合金
Zn content was low and no Cu, Se, Cr, As, Pb, and Hg were found in all the waterworks′ samples we determined.
两种水源中锌的含量均不高，所有水厂出厂水中硒、铜、铬、砷、铅、汞均未检出。
Objective: To explore the relationship between poor vision of children and the content of Zn, Fe, Cr, Cu in their hair.
目的：探讨学龄儿童头发锌、铁、铬、铜含量与视力低下的相关性。
Hot-process phosphoric acid contains a little impurities which are mainly Pb and very little Zn, Cu, Ni, Mn, Cr and Cd.
热法磷酸中含有少量重金属杂质，主要是铅以及微量的锌、铜、镍、锰、铬和镉等。
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