Changingvolume ratio of the two-chamber muffler can improve the effective noise reduction frequency range of the muffler.
通过改变消声器的两腔容积比，可以改善消声器的有效消声频率范围。
2
The volume of the graphical model (220) may be computed by the rule of disks, and a graphical or numerical display of the changingvolume with time displayed.
该图形化模型(220)的容积可以通过圆盘规则计算，并且显示随时间变化的容积的图形显示或者数值显示。
3
Gradient-density PUF was produced in two ways : mould shaping and embed shaping, through changingvolume filling coefficient, mass filling coefficient, and the size of foam core.