In a diesel engine, exhaust valves open before the intake ports are uncovered to （） Ⅰ.reduce pumping losses Ⅱ.reduce back pressure<br>A:Ⅰonly<br>B:Ⅱonly<br>C:bothⅠand Ⅱ<br>D:neitherⅠnor Ⅱ

In a diesel engine, exhaust valves open before the intake ports are uncovered to （） Ⅰ.reduce pumping losses Ⅱ.reduce back pressure
A:Ⅰonly
B:Ⅱonly
C:bothⅠand Ⅱ
D:neitherⅠnor Ⅱ

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