本文还重点介绍了锋范产品诞生的历史，上市后的营销推广活动。
This article also introduces emphatically the history of the birth of CITY products and the marketing promotion activities after CITY went public.
其实质是该磨钻头活动卡规是由主卡规和副卡规构成，卡心角与被卡钻头的锋角心位于同一条轴心上并在其卡规上设有指示刻度。
A clamping center Angle and the sharp Angle center of the clamped drill are positioned on the same shaft center, and the gauges are provided with indication graduations.
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