單項(xiàng)選擇題It is important to note that the injection only takes place when the plunger is moving up the cam （）.
A.base circle
B.slope
C.bottom point
D.top point
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1.單項(xiàng)選擇題The high-pressure fuel opens the fuel valve and is sprayed into the cylinder in tiny droplets known as （）.
A.injection
B.penetration
C.atomization
D.compression
2.單項(xiàng)選擇題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.
A.gears
B.rams
C.barrels
D.cams
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