The stress fields of en echelon faults with different geometry and mechanical conditions were considered by dynamically numerical simulation.
用数值模拟方法研究了几何、力学条件不同的雁列构造模型的应力场，探讨了几何参数对应力场的影响。
Results:As compared with TPN group, nitrogen balance was increased and mechanical ventilation time and treatment cost were decreased in EN group ( P <0.05).
结果：EN组氮平衡高于TPN组，机械通气时间、临床费用低于TPN组，组间差异均有显著性（P <0 .0 5 ）。
Objective To study the nursing emphases and the methods of reducing the complications of severe patients with enteral nutrition (en) during mechanical ventilation.
目的探讨重症病人机械通气期间肠内营养(EN)的护理重点和减少并发症的方法。
Objective To study the nursing emphases and the methods of reducing the complications of severe patients with enteral nutrition (en) during mechanical ventilation.
目的探讨重症病人机械通气期间肠内营养(EN)的护理重点和减少并发症的方法。
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