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

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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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英语

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