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单选题
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
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prevent fires in the pumproom by continually displacing flammable vapors
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