单项选择题
A pyrometer is an instrument commonly used to measure（）
A.cylinder pressure B.flame intensity C.exhaust gas temperature D.crankshaft axial alignment
单项选择题 Worn main bearings in a diesel engine can result in （）
单项选择题 When monitoring diesel engine performance, the most useful instrument to use is the （）
单项选择题 Low compression in a diesel engine could be caused by（）
