单项选择题
A.gravity B.viscosity C.density D.humidity
The top piston ring is plasma coated to give the lowest...
单项选择题The top piston ring is plasma coated to give the lowest wear rate to reach the goal of two-years’ with sufficient margin（）
A.TBO B.CEO C.CFO D.MCR
Around the combustion chamber, all the main components ...
单项选择题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
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
