单选题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 wallAⅠ onlyBⅡ onlyCeither Ⅰ or ⅡDneither Ⅰ or Ⅱ
单选题
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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