Combustible gas indicators operate by drawing an air sample into the instrument（）.<br>A:over an electrically heated platinum filament<br>B:where it is mixed with nitrogen<br>C:where it is ignited by a sparking device<br>D:where its specific gravity is measured

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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