datum surface
plural of snowbird
(obsolete) a strand of hair / the fibrous shaft or barb of a feather (especially that of the ostrich or peacock) used to make artificial flies for angling
(engineering) A surface on a workpiece that establishes a datum.
Not moraic.
最終加工の前に、平面度と直角度の公差を満たしているか確認するために基準面を検査してください。
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