单项选择题
A.no fuel will be delivered through the nozzle
B.the nozzle will overheat and crack
C.time of injection will change
D.fuel will leak into the drain line
单项选择题 If the flame from combustion in the cylinder of a four-stroke engine past the piston into the space below, the accumulation of flammable mixture would be ignited, thus resulting in （）.
单项选择题 If the engine does start on air, but combustion does not immediately begin, the cause may not be （）.
单项选择题 If the engine does start on air, but combustion does not immediately begin, the cause may be （）.