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Combustible gas indicators operate by drawing an air sample into the instrument ______．
A.Over an electrically heated platinum filament
B.Where it is mixed with nitrogen
C.Where it is ignited by a sparking device
D.Where its specific gravity is measured
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prevent the generation of flammable or combustible gas in tanksB
blow out cargo lines to prevent gas concentrationsC
dilute tank atmospheres to keep gas concentrations below the lower explosive limitD
prevent fires in the pumproom by continually displacing flammable vapors
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