What is the purpose of the intake/exhaust valves in a diesel engine? （）<br>A:They regulate the combustion cycle<br>B:They supply cooling water<br>C:They synchronize the ignition spark<br>D:They supply and regulate the lubricant flow

What is the purpose of the intake/exhaust valves in a diesel engine? （）
A:They regulate the combustion cycle
B:They supply cooling water
C:They synchronize the ignition spark
D:They supply and regulate the lubricant flow

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