根据这方法能够用可变长度的资料对地极坐标进行外推。
According to this process polar coordinates can be extrapolated by means of data in changeable length.
挤出温度升高，压力振荡频率减小，周期变大，外推滑移长度有变小趋势。
When the extrusion temperature was increased, the pressure vibration frequency and critical slid length decreased, while the vibration period increased.
挤出温度升高，压力振荡频率减小，周期变大，外推滑移长度有变小趋势。
When the extrusion temperature was increased, the pressure vibration frequency and critical slid length decreased, while the vibration period increased.
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