单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
For auxiliary engines the permissible overload is （） for one hour every twelve hours.
A.10%
B.15%
C.20%
D.25% -
单项选择题
The scavenge air receiver is of a simplified and modular design with integral non-return flaps, hanging cooler and two auxiliary air blowers（）
A.dozens
B.parcels
C.bundles
D.gallons
