In a medium speed diesel engine, a trunk type pist...
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

发布日期:2021-03-22

A.Ⅰ only

B.Ⅱ only

C.either Ⅰ or Ⅱ

D.neither Ⅰ or Ⅱ

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