It is composed of casing flange, casing crossjoint, wellhead valves, tubing hanger, tubing head crossjoint and accessories.
这种井口装置由套管法兰、套管大四通、井口阀、油管挂、油管挂体及相关附件组成。
2
This paper mainly expounds how to improve scientific management in colleges and universities so as to promote the crossjoint.
本文主要阐明在高等院校中，如何改进科研管理，以促进横向联合。
3
Last week, the regional Director for Africa brought together representatives from all other WHO regions to map out a joint strategy for eradication as a top, cross-regional priority for WHO.