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單項選擇題“l(fā)over-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

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1.單項選擇題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

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2.單項選擇題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

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3.單項選擇題If due to thick and hard deposits of carbon, the piston rings cannot move freely in their grooves, dark areas will often appear on the upper part of the cylinder wall (may not be the risible at port inspection)What condition of the piston rings can result in this phenomenon?（）

A.micro-seizure
B.sticking
C.scratched
D.breakage/ollapse

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4.單項選擇題If over a period of time, the oi1 film partially disappears, so that dry areas are formed on the cylinder wall, these areas and the piston surfaces will by frictional interaction, become finely scuffed and hardened, iegood mirror surface" will have deterioratedWhat condition of the piston rings can result in this phenomenon?（）

A.micro-seizure
B.sticking
C.scratched
D.breakage/collapse

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5.單項選擇題When good and steady service conditions have been achieved, the running surfaces of the piston rings and cylinder liner will be（）In addition, the rings will move freely in the grooves and also be well oiled intact, and not unduly worn.

A.hazy light
B.hazy light brown
C.hazy light blue
D.hazy light grey

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