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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...
1. 在粒子加速器中，带电粒子在电场的作用下改变其速度。例如，正离子在电场中从正极板向负极板移动时，受到正极板的排斥和负极板的吸引，从而加速。2. 直线型粒子...