The piston crown employs the usual jet-shaker principle with an arrangement of cooling bores in the crown so that the surface temperatures of the crown are moderate with a very even distribution（）<br>A:water cooling<br>B:oil cooling<br>C:air cooling<br>D:combined cooling

The piston crown employs the usual jet-shaker principle with an arrangement of cooling bores in the crown so that the surface temperatures of the crown are moderate with a very even distribution（）
A:water cooling
B:oil cooling
C:air cooling
D:combined cooling

出自：海船船员证

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