The satisfactory operation of diesel engine exhaust valves usually depends on（）<br>A:the proper back pressure<br>B:the cooling water temperature<br>C:correct timing and proper seating<br>D:accurate metering and the exhaust temperature

The satisfactory operation of diesel engine exhaust valves usually depends on（）
A:the proper back pressure
B:the cooling water temperature
C:correct timing and proper seating
D:accurate metering and the exhaust temperature

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