Piston cooling fins are located（）<br>A:atop the piston crown<br>B:beneath the piston crown<br>C:at the base of the piston skirt<br>D:inside the cylinder liner cooling water jacket

Piston cooling fins are located（）
A:atop the piston crown
B:beneath the piston crown
C:at the base of the piston skirt
D:inside the cylinder liner cooling water jacket

出自：海船船员证

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