Dustiness of a place may be considered at dustyness content of . . . . . . . . the air is moderatly dusty as per Russian text book.
A. 1 mg/m3
B. 5 mg/m3
C. 20 mg/m3
D. 10 mg/m3
Answer: Option B
This Question Belongs to Mining Engineering >> Miscellaneous In Mining
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