单项选择题
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
单项选择题 Low compression in a diesel engine could be caused by（）
单项选择题 The most common instrument used to measure diesel engine exhaust pressure is the （）
单项选择题 A sudden drop in compression pressure in one cylinder of a diesel engine can be caused by（）
