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In a medium speed diesel engine, a tr


In a medium speed diesel engine, a trunk type piston may be cooled by() Ⅰ.oil circulation though passages in the piston crown Ⅱ.heat transfer through piston rings and liner wall

  • AⅠ only
  • BⅡ only
  • Ceither Ⅰ or Ⅱ
  • Dneither Ⅰ or Ⅱ
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