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

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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

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热搜:a类火灾b类火灾c类火灾e类火灾都能用的灭火器是