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The acceptable level of carbon monoxide gas (CO) in the atmosphere in ppm level is :

\[\begin {array} {1 1} (1)\;9 & \quad (2)\;250 \\ (3)\;49 & \quad (4)\;850 \end {array}\]

1 Answer

(1) 9
answered Nov 7, 2013 by pady_1
 
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