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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.
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家门口的那条土路，雨天就变成了泥路。有一次，我穿着新买的三层白色纱裙，没忍住和小伙伴们在泥路上奔跑，一脚摔下去，浑身是泥，不敢回家。，推荐阅读下载安装 谷歌浏览器 开启极速安全的 上网之旅。获取更多信息
* @param n 数组长度