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A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm. | |
A. | 1000 to 2000 [Wrong Answer] |
B. | 3000 to 6000 [Wrong Answer] |
C. | 6000 to 9000 [Wrong Answer] |
D. | 10000 to 100000 [Correct Answer] |