单选题The exhaust ports of a diesel engine using the cross-flow scavenging method are opened and closed by the （）Areciprocating motion of exhaust valvesBrotary motion of the camshaftCreciprocating motion of the pistonDdeveloped differential
单选题
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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