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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...
医用直线加速器是利用微波技术对电子进行加速，产生高能射线(she xian)，用于人类医学实践中的远距离外照射放射治疗活动的大型医疗设备。它能产生高能X射线(she xian)和电子线，具有剂量率高，照射时间短...