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ThreeVPNproviders-Astrill, StrongVPN and Golden Frog-claimed last week that their services had been disrupted and become unavailable for users on the Chinese mainland...
醫用電子直綫加速器是利用微波電磁場加速電子並且(bing qie)具有直綫運動軌道的加速裝置(zhuang zhi),能夠產生高能X射綫和電子綫,具有照射野大,劑量均勻性和穩定性好及半影區小等特點,主要用於腫瘤的放射...