The automatic test system which can measure action time and release time of the relay is designed. 设计了测量继电器动作时间与释放时间的自动测试系统。
Automatic vertical drilling tool can ensure a vertical wall, at the same time effectively release drilling pressure, which can be well applied in oil and gas exploration of high and steep stratigraphic in western China. 自动垂直钻井工具能在保证井眼垂直的条件下,有效释放钻压,能够很好的应用于我国西部高陡构造地层的油气开采。