單項(xiàng)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

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單項(xiàng)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

單項(xiàng)選擇題

For auxiliary engines the permissible overload is （） for one hour every twelve hours.

A.10%
B.15%
C.20%
D.25%