The utility model provides an integral petroleum production tree, which is characterized in that a pipe cross and mutually connected main bars are a hollow and cuboid integral forging piece;
本实用新型提供一种整体式采油气树，其特征是四通和相互连接的主杆为一个空心长方体的整体锻压件；
Regulating regimes of metered heating system are analyzed by means of computer simulation. This paper gives the control mode of consumer heat inlet that applies to one-pipe cross-over heating system.
通过计算机模拟分析了计量供热系统的调节工况，给出了适用于单管跨越式供热系统的热力入口控制方式。
The stress distribution of a curved pipe with an initial elliptic cross section under internal pressure was studied by using electric resistance strain method.
采用电阻应变测量技术研究了带有初始随圆度的弯管在纯内压作用下的应力分布。
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