The exhaust ports of a diesel engine using the cross-flow scavenging method are opened and closed by the （）<br>A:reciprocating motion of exhaust valves<br>B:rotary motion of the camshaft<br>C:reciprocating motion of the piston<br>D:developed differential

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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