upper contact

At this point the upper stem has lost contact with the diaphragms.

在此时,上阀杆已经失去了同横膈膜的接触.

The system is based on a detection unit of the contact wire which will be installed on the upper part of the vehicle body to realize the dynamic control of the contact wire and guarantee the safety of the railway lines.

检测系统直接安装在机车上，实现在机车运行过程中对接触导线的在线监测，提高机车运行的安全性。

Circular design is adopted for the upper and lower end face of centralizer body to avoid contact with the tubing and the wear and tear between pumping rod and tubing ends of.

扶正体上下端面采用圆弧设计，避免了与油管接触、抽油杆与油管端部的相互切削与磨损。

Late Yanshan stage was compressive crust deformation which not only formed the wedge-type thrust structure but also caused upper Cretaceous Series unconformable contact with lower Cretaceous Series.

燕山晚期地壳以挤压逆冲变形为主，不仅形成了楔冲式推覆构造，也使上白垩统与下白垩统为角度不整合接触。