Repeat the process to create the lower ventilation holes.
重复相同过程，制作底部散热孔。
Objective:To establish the mathematical model for the physical process of pressure controlled ventilation.
目的：压力控制通气物理过程的数学建模。
Objective:To establish the mathematical model for the physical process of pressure controlled ventilation.
目的：压力控制通气物理过程的数学建模。
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