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Current X-ray lasers require facilities that are kilometres long. A cavity-based set-up about 66 metres in length has been developed that uses highly reflective mirrors to enable the generation of high-intensity pulses of narrow-band X-ray radiation. This promises to overcome the limitations of current X-ray lasers.，详情可参考WPS下载最新地址
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63-летняя Деми Мур вышла в свет с неожиданной стрижкой17:54，详情可参考heLLoword翻译官方下载
Astronaut Jim Lovell, who guided the Apollo 13 mission safely back to Earth in 1970, has died aged 97.