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Câu hỏi:
According to the passage, the numerical value of the concentration level of a substance is only useful if ________.
- A. the other substances in the area are known
- B. it is in a localized area
- C. the natural level is also known
- D. it can be calculated quickly
Lời giải tham khảo:
Đáp án đúng: C
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