A.the upward stroke
B.the downward stroke
C.the power stroke
D.the suction stroke
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A.clockwise
B.anticlockwise
C.crosswise
D.vertically
A.transverse
B.longitudinal
C.circumferential
D.radial
A.micro-seizure
B.scratch
C.break
D.stick
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
A.micro-seizure
B.sticking
C.scratched
D.breakage/ollapse
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