单选题When monitoring diesel engine performance, the most useful instrument to use is the （）Adwell-tachometerBexhaust gas pyrometerCfuel flow rate meteDexhaust gas analyzer
单选题
When monitoring diesel engine performance, the most useful instrument to use is the （）
A
dwell-tachometer
B
exhaust gas pyrometer
C
fuel flow rate mete
D
exhaust gas analyzer
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