Pyrometers commonly found on diesel engine exhaust systems, consist of（）<br>A:pyrostats and a voltmeter<br>B:a gas-filled bellows, a tube and a pressure gauge<br>C:thermocouples and a voltmeter<br>D:ammeters and thermocouples

Pyrometers commonly found on diesel engine exhaust systems, consist of（）
A:pyrostats and a voltmeter
B:a gas-filled bellows, a tube and a pressure gauge
C:thermocouples and a voltmeter
D:ammeters and thermocouples

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