单选题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.AclockwiseBanticlockwiseCcrosswiseDvertically
单选题
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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