The model selection of population prediction and scientific confirmation of prediction parameters are two most important basic steps.
人口预测模型的选择和预测参数的科学认定，是人口预测实践中最重要的两个基本环节。
EBW procedure of pyramidal horn antenna was researched, including joint design, welding parameters confirmation, etc. And the comparisons with TIG procedure were also made.
研究了角锥喇叭天线的电子束焊接工艺，并与传统的氩弧焊成形工艺进行了对比。
EBW procedure of pyramidal horn antenna was researched, including joint design, welding parameters confirmation, etc. And the comparisons with TIG procedure were also made.
研究了角锥喇叭天线的电子束焊接工艺，并与传统的氩弧焊成形工艺进行了对比。
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