單項選擇題

Around the combustion chamber, all the main components are bore cooled to give low strains and the smallest, circumferentially symmetric deformations for good sealing between piston rings and liner（）

A.thermal
B.mechanical
C.plastic
D.elastic

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單項選擇題

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

單項選擇題

Top piston rings are plasma coatedIt gives added safety for the of new lines（）

A.running-in
B.running-out
C.running on
D.running down