The tradition style of iranian sword, for exemple in sassanid dynasty as in china, were long straight blade with double edges.
其实伊朗长刀的传统，一如中国长刀，是直型双刃长刀。
This paper labored the design means and steps for NC machining center entering system , and we checkouted the design of entering system with the exemple of XH768 horizontal machining center.
详细分析数控加工中心进给系统的设计方法和步骤，并以XH768卧式加工中心为例对进给系统的设计进行了校验。
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