单项选择题 A large change in ambient temperature, or using an oil of a viscosity different from the one recommended by the manufacturer in a mechanical hydraulic governor, will result in the need to adjust the （）.

单项选择题 Which of the following methods is normally used to lubricate bearings in a small high-speed diesel engine?（）

单项选择题 Friction developing between the moving parts of a governor, governor linkage and control valve will cause the governor to （）.