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civil engineering upsc civil service exam questions
1. What are the values of tolerable CO concentration in residential area, for continuous exposure durations of 1 hour and 8 hours, respectively ?
(A): 1 and 2 mg / m3
(B): 4 and 2 mg / m3
(C): 4 and 6 mg / m3
(D): 5 and 1 mg / m3
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