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 （）.<br>A:the crankcase explosion<br>B:lifting of the cylinder safety valve<br>C:a scavenge fire<br>D:opening of the manhole

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 （）.
A:the crankcase explosion
B:lifting of the cylinder safety valve
C:a scavenge fire
D:opening of the manhole

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