Which statement is TRUE concerning combustible gas indicators ________．A.One sample of air is adequate to test a tankB.They do not work properly where there is a lack of oxygenC.They will detect a lack of oxygenD.They are calibrated to read the percentage chance of explosion
Which statement is TRUE concerning combustible gas indicators ________．
A.One sample of air is adequate to test a tank
B.They do not work properly where there is a lack of oxygen
C.They will detect a lack of oxygen
D.They are calibrated to read the percentage chance of explosion
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