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问题

Valves in the cylinder head of a diesel engine are opened by the direct action of the ____


Valves in the cylinder head of a diesel engine are opened by the direct action of the ____.

A.exhaust pressure

B.valve spring pressure

C.rocker arm movement

D.wrist pin movement

请帮忙给出正确答案和分析,谢谢!

参考答案
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