单项选择题
A.clockwise B.anticlockwise C.crosswise D.vertically
“lover-leafing”is a term used to describe corrosive wea...
单项选择题“lover-leafing”is a term used to describe corrosive wear at several separate points around liner circumference- iein some cases the liner bore may assume a “clover-leaf”shape（）
A.transverse B.longitudinal C.circumferential D.radial
If the gas pressure behind the ring is built up too slo...
单项选择题If the gas pressure behind the ring is built up too slowly, and thereby exerts an inadequate outward pressureIn such a case, the combustion gas can penetrate between the liner and ring, and violently force the ring inwards, in the grooveWhat result will this type of sudden "shock" loading eventually lead to?（）
A.micro-seizure B.scratch C.break D.stick
Broken piston rings manifest themselves during the scav...
单项选择题Broken piston rings manifest themselves during the scavenge port inspection by（）
A.Lack of elastic tension, when the rings are pressed into the groove by means of a stick B.Blackish appearance C.Fractured rings and missing rings D.all off the above
