方法：回顾性分析178例经皮中心静脉置管患者的临床资料。
Methods: Clinical data of 178 cases with percutaneous central venous catheterization were analyzed retrospectively.
提出管塔制作中钢管中心线的两种计算方法，并分析它们的适用情况。
Bring forward two ways to compute the center line of steel tube and analyze thein respectie application.
通过对水击规律的认识，提出控制水击压力破坏阀门、中心管的具体措施和有效方法。
Through understanding the principles of water strike, this paper advanced an effect measure to control the water strike to destroy valve and center pipe.
应用推荐