If the cross section area of the two branching ducts are different, the Included angle on the smaller branch duct against the extended center line is usually bigger.
若分枝管的截面积大小不同，则细支管与母管中心延长线间的夹角较大；
If the cross section area of the two branching ducts are different, the Included angle on the smaller branch duct against the extended center line is usually bigger.
若分枝管的截面积大小不同，则细支管与母管中心延长线间的夹角较大；
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