Around the combustion chamber, all the main components are to give low thermal strains and the smallest, circumferentially symmetric deformations for good sealing between piston rings and liner（）<br>A:drill cooled<br>B:hole cooled<br>C:tube cooled<br>D:bore cooled

Around the combustion chamber, all the main components are to give low thermal strains and the smallest, circumferentially symmetric deformations for good sealing between piston rings and liner（）
A:drill cooled
B:hole cooled
C:tube cooled
D:bore cooled

出自：海船船员证

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