datum line
4.Hangzhou Linan Hua Sheng Biaoye the production factory rectifies names in 2000 to be founded, the complete technical management personnel by the original Zhejiang Linan wristwatch bolt and nail factory and the Linan puncture accessories factory two factories apexes combination, the factory has the state-owned business management management foundation quality, observes the formulation quality to guarantee requests LOT the qualified determination criterion for the datum investment manufacture puncture accessories production line and the bolt production line, take the fine city prestige, forms a complete set as the domestic and foreign clocks and watches company.
5.Therefore, the method of screen spreading is presented herein with the following basic feature: taking the surface of the perpendicular line at the end of the distortion and bottom as the datum plane, move the controlling point of every distortion part to the datum plane with the principle of changeless of geometry size, and then the spreading is formed.
