First, the optimum balance of mechanical and natural ventilation is estimated and used to determine the maximum potential saving it could give when compared with natural ventilation alone.
首先，人们对机械通风和自然通风的最佳平衡进行了预测，当与只使用自然通风相比较时，用它来决定机械通风系统能够给予的最大潜在储量。
Widely used for electrical rotors, machine tool spindle electric tools, such as rotary ventilation her body balance calibration.
广泛应用于电机转子、电动工具机床主轴、通风设备等旋转体工件平衡校正。
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 ）。
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