光学经纬仪广泛应用于航天测控靶场，任务时由操作手操纵单杆控制经纬仪捕获跟踪目标。
The Optical-Measuring-Equipments are used in the TTC area widely, in mission, which are manipulated by operators to capture and track the target in space.
门座式起重机分单臂架和四连杆两种类型，起重机的起升、变幅、回转和行走四大机构均采用交流变频调速，整机采用PLC控制，使用性能优越。
Portal crane sub frame and four-link arm two types, from the crane hoisting, luffing, slewing and walking four agencies ac frequency control, the machine USES PLC control, superior performance.
以位移控制为目标，通过调整锚杆的位置，对单支点桩锚支护结构的设计进行优化。
Finally, the design about the single fulcrum pile_anchor retaining structure is optimized by adjusting the position of anchor to make the displacement of the top end of the pile the smallest.
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