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航测内业的精密测图仪器（如：TopocarB精密立体测图仪等）都是利用电磁力作为起落笔的动力（见图1），当脚踏开关松开，软铁笔杆被弹簧顶起；
Aerospace industry, precision mapping instruments (such as: TopocarB precision stereograph, etc.) are the use of electromagnetic force as the lifting pen power (see Figure 1), when the foot switch is released, the soft iron rod is the top of the spring;