單項(xiàng)選擇題If there are micro-seized areas on the liner or skirt scratch-over manually with a coarse carbo-rundum stone (grindstone), moving the grindstone () at an angle of 20 to 30 degrees to horizontal.

A.clockwise
B.anticlockwise
C.crosswise
D.vertically


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3.單項(xiàng)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