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In a diesel engine, exhaust valves op


In a diesel engine, exhaust valves open before the intake ports are uncovered to () Ⅰ.reduce pumping losses Ⅱ.reduce back pressure

  • AⅠonly
  • BⅡonly
  • CbothⅠand Ⅱ
  • DneitherⅠnor Ⅱ
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