One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； Question 457
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Single-choice question: The maximum allowable concentration of vinyl chloride in the air of the workshop operation area is 30 mg/m3, which is approximately equivalent to a volume concentration of ( ) ppm. A 15.3 B 24.1 C 11.7 Answer: C 11.7
C11.7~~~~~~~~~~~~~~~~~~
The maximum allowable concentration of vinyl chloride in the air of the workshop operation area is 30 mg/m3, which is equivalent to a volume concentration of (C) ppm. A 15.3 B 24.1 C11.7