When possible, try to maintain a single systemground point.
如果可能，应尽量采用单一的系统接地点。
2
To meet the needs of certain type of aircraft avionic systemground test, a set of air data computer stimulating system was designed.
针对某型飞机航电系统地面试验的需要，设计了一套大气数据计算机激励器系统。
3
Under the OSSS contract, Harris provided operations, maintenance and support services to the Air Force Satellite Control network and Global Positioning Systemground networks.