When monitoring diesel engine performance, the most useful instrument to use is the （）<br>A:dwell-tachometer<br>B:exhaust gas pyrometer<br>C:fuel flow rate mete<br>D:exhaust gas analyzer

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

出自：海船船员证

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