Tugisirgeoru sirgsushälve on määratletud ainult vähimruutude meetodil arvutatud tugisirgete kohta, kusjuures spetsifikatsioonis kasutatakse lisatähist GV, et näidata, et vähimruutude meetodil arvutatud tugisirgeoru sirgsushälbe suhtes kehtib kujutolerants.
The reference-to-valley straightness deviation is defined anly for least squares reference lines. The modifier GV is used in specifications to indicate that a form tolerance applies to the reference-to-valley deviation relative to the least squares reference element.
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