The flow line function and the flow function for extrusion were obtained from the construction of velocity discontinuity lines(VDL).
由构造速度间断线模型入手，建立正挤压的流线方程，以便求得是流函数。
The flow line function and the flow function for extrusion were obtained from the construction of velocity discontinuity lines(VDL).
由构造速度间断线模型入手，建立正挤压的流线方程，以便求得是流函数。
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