【Safety Skills】What are the criteria for passing chemical analysis in hot work operations?
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The standard for fire hazard analysis as per national regulations is that when the lower explosion limit of the gas or vapor being tested is greater than or equal to ( ), its concentration should be less than 0.5%； When the explosion lower limit is less than 4%, its concentration should be less than ( ). A.4 0.5% B.4 0.2% C.2 0.5% D.2 0.2% Answer: B
The standard for fire hazard analysis as per national regulations is that when the lower explosion limit of the gas or vapor being tested is greater than or equal to ( ), its concentration should be less than 0.5%； When the explosion lower limit is less than 4%, its concentration should be less than ( ). A.4 0.5%
The standard for fire hazard analysis as per national regulations is that when the lower explosive limit of the gas or vapor being tested is greater than or equal to (B), its concentration should be less than 0.5%； When the explosion lower limit is less than 4%, its concentration should be less than ( ). A.4 0.5% B.4 0.2% C.2 0.5% D.2 0.2%