IN_CALIBRATION_OF_CO2_ANALYSER,_IN_ORDER_TO_ESTABLISH_ZERO_CALIBRATION – McqOptions

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1.	IN_CALIBRATION_OF_CO2_ANALYSER,_IN_ORDER_TO_ESTABLISH_ZERO_CALIBRATION_WHICH_OF_THE_FOLLOWING_IS_USED_AS_SAMPLE??$
A.	Oxygen
B.	Hydrogen
C.	Inert gases
D.	Nitrogen
Answer» D. Nitrogen

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