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  3. What are some of the problems that Chromium Ⅵ can cause? How much Chromium Ⅵ is a safe amount?

What are some of the problems that Chromium Ⅵ can cause? How much Chromium Ⅵ is a safe amount?

admin2009-08-21  91
问题 What are some of the problems that Chromium Ⅵ can cause?
How much Chromium Ⅵ is a safe amount?
选项 A、No safe level.
B、6 %.
C、It is safe.
D、No one knows.
答案A
解析 见原文倒数第三段。科学家们发现没有气体中铬的安全排放量标准。
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