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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...
100cm。医用加速器的剂量刻度官网显示，通常加速器的刻度是在标准条件下进行，即SSD=100cm，射野为(ye wei)10cmx10cm的水模内射束中心轴上最大剂量点dm处的输出量被刻度成1...