单项选择题
The main purpose of warming the parts of the main engine is （）
A.to reduce heat stress B.to reduce low temperature corrosion C.to improve firing and starting performance D.fuel saving
单项选择题 The main purpose of starting the diesel engine on air briefly is（）
单项选择题 The purpose of engine stand-by is that （）
单项选择题 Which is false about engine trials?（）
