A. 200 particles/cm3 B. 250 particles/cm3 C. 300 particles/cm3 D. 450 particles/cm3
Home/Civil Engineering (MCQs)/Tunnel Engineering/The concentration of the dust particles of the size 0.5 to 5 microns adjacent to the working face should not be more than_____. Tunnel Engineering The concentration of the dust particles of the size 0.5 to 5 microns adjacent to the working face should not be more than_____. A. 200 particles/cm3 B. 250 particles/cm3 C. 300 particles/cm3 D. 450 particles/cm3 Answer: Option D. Explanation: No answer description available for this question. Show AnswerDiscussion
