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问题

The exhaust ports of a diesel engine using the cross-flow scavenging method are opened and


The exhaust ports of a diesel engine using the cross-flow scavenging method are opened and closed by the _________.

A.reciprocating motion of exhaust valves

B.rotary motion of the camshaft

C.reciprocating motion of the piston

D.developed differential

请帮忙给出正确答案和分析,谢谢!

参考答案
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