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<br>A:Ⅰ only<br>B:Ⅱ only<br>C:either Ⅰ or Ⅱ<br>D:neither Ⅰ or Ⅱ

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
A:Ⅰ only
B:Ⅱ only
C:either Ⅰ or Ⅱ
D:neither Ⅰ or Ⅱ

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