单项选择题 The high-pressure fuel opens the fuel valve and is sprayed into the cylinder in tiny droplets known as （）.

单项选择题 Because the timing of injection is crucial, （） mounted on the camshaft, which is driven by the crankshaft are used to operate the fuel pumps, one of which is provided for each cylinder.

单项选择题 Fuel has to be injected into the engine at a high pressure so that it （） correctly.