单项选择题 Which of the following condition is likely to develop if the thermocouple element of a pyrometer becomes coated with excessive amounts of combustion by-products?（）

单项选择题 Excessive lubricating oil consumption in a running diesel engine can be caused by （）

单项选择题 If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will（）