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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
参考答案
更多 “ 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 ” 相关考题
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did; setB
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CO2B
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