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Instead of a continuous stream, the electron beam is divided into nanosecond-long bunches—billions of electrons riding the radio-frequency field like surfers. Inside the accelerator’s cavities, the field flips polarity 12 billion times per second, so timing is everything: Only electrons that arrive perfectly in phase with the accelerating wave will gain energy. That process repeats through a chain of cavities, each giving the bunches another push, until the beam reaches its final energy of 200 MeV.
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本报北京3月10日电 （记者褚君）外交部发言人郭嘉昆10日表示，经各方共同努力，已有1万余名中国旅客自阿联酋、阿曼、沙特等国安全有序返回，中国驻有关国家使领馆将全力为当地有需要的中国公民提供必要协助。。业内人士推荐手游作为进阶阅读
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В России изменились программы в автошколах22:30