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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...
一、什么是质子重离子(zhong li zi)放射治疗(zhi liao)设备(she bei)? 医用质子重离子(zhong li zi)放射治疗(zhi liao)设备(she bei)(图1)是一种利用质子或重离子(zhong li zi)射线治疗(zhi liao)肿瘤的医疗设备(she bei)。这些设备(she bei)通常包括质子加速器、重离子(zhong li zi)加速器以及精确的剂量控...