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问题

The exhaust valve opens before bottom dead center in a four stroke engine to______Iallow f


The exhaust valve opens before bottom dead center in a four stroke engine to______Iallow for blow down IIReduce pumping losses

A.I only

B.II only

C.both I and II

D.neither I nor II

请帮忙给出正确答案和分析,谢谢!

参考答案
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