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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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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