该算法首先计算序列的平均功率，然后对其进行谱分析并作平滑处理而完成伪码速率的判定。
This algorithm firstly calculates the average power serial, and then finishes the detection of PN code rate through the analysis of frequency spectrum and smooth processing.
不要留旧标签在使用过的纸箱上，运单应贴在箱面上，不可遮盖运单的电脑条纹码(包括用透明胶纸)，要保持运单平滑干净。
Remove all old shipping labels, place the DTW Express Waybill on top of the package; never cover THD bar-code (even with transparent tape); do not allow labels to become wrinkled or dirty.
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