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.
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He believes that the finds could help people understand wider landscape change now and in the past.,推荐阅读搜狗输入法下载获取更多信息
优势:时间复杂度O(n+k),k为数据范围
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