A . 进气门0.25-0.30mm,排气门0.30-0.35mmB . 进气门0.30-0.35mm,排气门0.25-0.30mmC . 进气门0.20-0.25mm,排气门0.30-0.35mmD . 进气门0.15-0.20mm,排气门0.30-0.35mm
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