单选题In a diesel engine, when the fuel is injected into the cylinder,（）Athe piston is just coming upward from the bottom dead centerBthe piston has moved about one-fifth of the way upCthe piston has moved most of the way up and almost reached the TDCDthe piston has just past the TDC
单选题
In a diesel engine, when the fuel is injected into the cylinder,（）
A
the piston is just coming upward from the bottom dead center
B
the piston has moved about one-fifth of the way up
C
the piston has moved most of the way up and almost reached the TDC
D
the piston has just past the TDC
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