单项选择题 In a unit injector the amount of fuel that will be forced through the spray nozzle on each stroke of the plunger depends on （）

单项选择题 If an auxiliary diesel engine temperature is higher than normal ,but the thermostat is determined not to be defective you would suspect a /an （）

单项选择题 Which of the following beneficial results can be expected from supercharging a previously naturally aspirated engine?（）