Aerospace series - elements of electrical and optical connection - test methods - part 707 : electrical elements - measurement of characteristic impedance of a bus or a stub terminator 航空航天系列.电气及光学连接元件.试验方法.第707部分:电气元件.总线或短线端子的特性阻抗的测量
It is made of high quality instruction machine ; electric parts , auto ? control with 2 times plus wind , auto time - control and alarm material and so on . it can ensure human safety from dangerous 采用国产的优质指示仪表，国产优质电气元件，自复位透明，阀门带有二次送风开关自动时间宝及报警上等保温材料，保温好。
Based on the activex technology , electric component menus and toolbars are created in this paper , with which a net wiring diagram for power electronics system is drawn . take advantage of autocad events , it is easy to fully carry out the consistency between graphics and data , from which users can manage databases and visual operation on graphics . the graphics about short - circuit current distribution and protection coupling are auto - drawn by using the autocad entity and text objects 本文采用activex技术，创建电气元件菜单和工具栏，方便用户绘制电力系统网络接线图；利用autocad事件，实现图形数据的一体化，从而可以使用户在图形上操作和管理数据库以及计算的可视化操作；利用autocad的图形和文本对象来自动绘制短路电流分布图和保护整定图。
