In some diesel engine designs,（）the injection of cylinder oil is timed to impinge when the piston and only impinge on（）<br>A:is coming upward；cylinder ring belt<br>B:is going downward；piston ring belt<br>C:is coming upward；piston ring belt<br>D:is going downward；cylinder ring belt

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

出自：海船船员证

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