单项选择题
A.high fuel oil viscosity
B.low fuel oil temperature
C.high lube oil viscosity
D.energized glow plugs
单项选择题 Which of the listed diesel engine operating conditions should be checked immediately after any diesel engine is started?（）
单项选择题 Adjustments to the compensating needle valve in a hydraulic governor should be made with the engine at （）
单项选择题 To guarantee that a reduction gear bearing is receiving proper oil supply, you should check the （）