单项选择题 When an air started, four-stroke/cycle diesel engine is being cranked, the starting air is admitted to each cylinder during what would normally be the（）

单项选择题 Which of the general advantages listed does the electrical pyrometer have over the mechanical pyrometer?（）

单项选择题 The loss of the diesel engine cylinder air charge through leaky valves, piston rings, worn or scored liners, would be indicated by which of the following sets of conditions?（）