... 贝他石墨 beta graphite 贝他铁 beta iron 贝他粒子 beta particle ...
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N a nonmagnetic allotrope of pure iron stable between 770°C and 910°C β铁
RC means release candidate, it basically means a beta (test version) iron the bugs out before release of official version... which is available now.
rc意思是发布候选。软件正式版发布前发布的一个版本，用来公测以消除软件缺陷。
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