If the meter needle of the oxygen indicator cannot be set to zero，what should be done ________．A.Replace the batteriesB.Check the sampling tube for blockageC.Adjust the final reading by the amount the needle is displaced from zeroD.Replace the platinum filament
If the meter needle of the oxygen indicator cannot be set to zero，what should be done ________．
A.Replace the batteries
B.Check the sampling tube for blockage
C.Adjust the final reading by the amount the needle is displaced from zero
D.Replace the platinum filament
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