What could result in an incorrect oxygen concentration reading on the oxygen indicator ________．A.Exposure to carbon dioxide for no more than 1 minuteB.Exposure to carbon dioxide for more than 10 minutesC.Exposure to a very low concentration of sulfur dioxide for no more than 2 minutesD.None of the above
What could result in an incorrect oxygen concentration reading on the oxygen indicator ________．
A.Exposure to carbon dioxide for no more than 1 minute
B.Exposure to carbon dioxide for more than 10 minutes
C.Exposure to a very low concentration of sulfur dioxide for no more than 2 minutes
D.None of the above
相关考题：
Before entering a fuel tank that has been cleaned, it should be checked with an oxygen indicator and a/an ____.A.Orsat apparatusB.flame safety lampC.Halide torchD.combustible gas indicator
When anaerobic bacteria convert the sewage to an inert sludge, .A.no oxygen is neededB.oxygen is necessaryC.oxygen is given offD.no gas is produced
What is the best instrument for establishing a safe working area before welding in a confined space?A.An oxygen indicatorB.A combustible gas indicatorC.A combination combustible gas and oxygen indicatorD.A flame safety lamp
While testing a cargo tank，your oxygen indicator reads 25% oxygen in the tank. You would then ______.A.enter the tank safelyB.suspect the accuracy of the readingC.ventilate the tankD.test for nitrogen
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
You are testing a tank that contained gasoline by using a combustible gas indicator．Under testing，the tank sample caused the needle to move rapidly to 100 on the dial then fall to zero．What is the concentration of flammable gas ________．A.Less than the flammable rangeB.Within the flammable rangeC.Over the flammable rangeD.The explosimeter is defective and giving a false reading
What can cause a lack of oxygen in a chain locker ________．A.AbsorptionB.OsmosisC.EvaporationD.Oxidation
______is not one of the most important environmental factors that influence hydrocarbon biodegradation．A.temperatureB.concentration of nutrientsC.nitrogenD.oxygen
After each reading of an oxygen indicator, the instrument should be purged with ______.A.CO2B.fresh airC.the tested compartment’s airD.Water
An oxygen indicator can be used to determine if there is ______.A.sufficient oxygen in a compartment to support lifeB.combustible gases presentC.hyfrogen gases presentD.All of the above
Deficient oxygen content inside a chain locker can be detected with ______.A.litmus paperB.a combustible gas indicatorC.an oxygen breathing apparatusD.an oxygen indicator
单选题The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of （）.Aseawater contaminationBfrequent surface blowsCdissolved oxygen deaerationDfrequent bottom blows
单选题A combustible gas indicator is used to determine （）.Aif there is sufficient oxygen to support lifeBthe toxicity of flammable gases or vaporsCthe amount ofCO2 present in flue gasDthe presence of flammable gases or vapors in the air
单选题Carbon dioxide flooding system is used for extinguishing fires because it reduces the concentration of oxygen in the air to（）.Aflashing pointBcombustion pointCauto-ignition pointDlower explosive limit
单选题If the meter needle of the oxygen indicator cannot be set to zero，what should be done? （）AReplace the batteriesBCheck the sampling tube for blockageCAdjust the final reading by the amount the needle is displaced from zeroDReplace the platinum filament
单选题Should a person be overcome due to lack of oxygen and high concentration of refrigerant, treat with（）.Afresh waterBfresh airCsalt waterDartificial respiration
单选题What can cause a lack of oxygen in a chain locker（）．AAbsorptionBOsmosisCEvaporationDOxidation
单选题What is required in addition to the heat，fuel，and oxygen of the fire triangle to have a fire?（）AElectricityBChain reactionCPressureDSmoke
单选题Deficient oxygen content inside a chain locker can be detected with（）.Alitmus paperBa combustible gas indicatorCan oxygen breathing apparatusDan oxygen indicator
单选题Before entering a fuel tank that has been cleaned, it should be checked with an oxygen indicator and a/an（）.AOrsat apparatusBflame safety lampCHalide torchDcombustible gas indicator
单选题A combination combustible gas and oxygen indicator is an instrument that measures the（） of both combustible gas and oxygen; each is indicated on a separate meter.ApurifiesBcombinationsCconcentrationsDfilters
单选题An oxygen indicator will detect （）.Athe amount of oxygen in a spaceBthe presence of harmful amounts of carbon monoxideCconcentrations of explosive gasDAll of the above
单选题After each reading of an oxygen indicator，the instrument should be purged with（）.ACO2Bfresh airCthe tested compartment's airDwater
单选题While testing a cargo tank，your oxygen indicator reads 25% oxygen in the tank. You would then （）.Aenter the tank safelyBsuspect the accuracy of the readingCventilate the tankDtest for nitrogen
单选题Deficient oxygen content inside a chain locker can be detected with（）.Alitmus paperBcombustible gas indicatorCoxygen breathing apparatusDoxygen indicator