单选题In some diesel engine designs,（）the injection of cylinder oil is timed to impinge when the piston and only impinge on（）Ais coming upward；cylinder ring beltBis going downward；piston ring beltCis coming upward；piston ring beltDis going downward；cylinder ring belt
单选题
In some diesel engine designs,（）the injection of cylinder oil is timed to impinge when the piston and only impinge on（）
A
is coming upward；cylinder ring belt
B
is going downward；piston ring belt
C
is coming upward；piston ring belt
D
is going downward；cylinder ring belt
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